does sound travel faster in water or soliddoes sound travel faster in water or solid
In this article we will answer how sound travels and how to calculate how far it travels in different scenarios. Would the reflected sun's radiation melt ice in LEO? Direct link to Teacher Mackenzie (UK)'s post an iron girder is rigid b. These vibrations enter the outer ear and cause our eardrums to vibrate (or oscillate). modulus of more rigid materials usually compensates for By entering your details, you are agreeing to our terms and conditions and privacy policy. Sound travels by particles bumping into each other as they vibrate. The properties of a sound wave change when it travels through different media: gas (e.g. C. Reflected sound is called vibration. The sound has travelled faster through air because the increased temperature has increased the vibrations of the molecules. This happens extremely fast and is detected as a wave of pressure. Solids are packed together tighter than liquids and gases, hence sound travels fastest in solids. Sound travels more quickly through solids than through liquids and gases because the molecules of a solid are closer together and, therefore, can transmit the vibrations (energy) faster. V is the speed of sound. Well it turns out that the Stiff, rigid materials This concept is particularly hard to believe since our general experiences lead us to hear reduced or garbled sounds in water or behind a solid door. compression: The process of squeezing together or closer. Although that might seem fast, it is not nearly as fast as light, which travels at 186,411.358 miles per hour. change the speed of sound is to change the properties of This is why we often cant hear someone calling from very far away when theres loud music playing because the high frequencies are being blocked out by all the noise! This results in a wave of vibrations travelling through the air to the eardrum, which in turn also vibrates. Water is about 15,000 times less compressible than air, but it is also 800 times denser. Can sound waves deform (curl brake) like water waves? What about hot humid air? Planned Maintenance scheduled March 2nd, 2023 at 01:00 AM UTC (March 1st, We've added a "Necessary cookies only" option to the cookie consent popup, Speed of Sound greater in denser Materials linked to restoring force. This is because in a stiff material, each molecule is more interconnected to the other molecules around it. But the next 6dB reduction means moving from 20 to 40 metres, then from 40 to 80 metres for a further 6dB reduction. This is why the speed of sound is faster in solids than in liquids and gases. Let's compare it with 90 F (warm bath temperature). In the case of sound, the runners are particles and the information (baton) they are passing along is energy of vibration. At low frequencies (below around 1000 Hz), sound waves tend to travel in all directions more or less equally and bounce off objects like a rubber ball would. These cookies ensure basic functionalities and security features of the website, anonymously. It only takes a minute to sign up. As it is disturbed, each molecule just moves away from a resting pointbut then eventually returns to it. Now I didn't get one thing what's the difference between rigidity and density ? This is why we can often hear someone coming before we see them - the sound waves are travelling through the solid ground to our ears! This is why we see such variation in the table of solids. But I do not understand how a solid that is inflexible can make sound waves travel faster then in a flexible liquid. Direct link to Ashlie Bloom's post What about hot humid air?, Posted 8 years ago. Does density matter? (6 Potential Causes), Why Is My Dryer Making a Grinding Noise? Use these activities to explore some essential physics ideas relating to sound, but in a whole new way. For example, how does density affect the speed of sound? molecule: A particle made up of particular atoms. any larger densities. Thats because the thermocline layer features rapid changes in pressure and temperature. My textbook, College Physics - a strategic approach by Knight/Jones/Field, states, "The speed of sound doesn't depend on the pressure or the density of the gas" on page 474 in chapter 15 on Traveling Waves and Sound. Required fields are marked *. The Guiness World Record of the Farthest distance travelled by a human voice belongs the Spanish-speaking inhabitants of the Canary Island of La Gomera, is intelligible under ideal conditions at 8 km (5 miles). Water vapors are less dense than dry air at a constant temperature. So how far does sound travel? Ty distils the world around him into its basic geometry, prompting us to look at the mundane in a different way. Does With(NoLock) help with query performance? up the air that a sound wave is travelling through, the However, air is all around you, and learning the way it affects sound speed can help you figure out the perfect way to soundproof your environment and enjoy a noise-free life! Why does sound travel faster in water and solids? When molecules in a medium vibrate, they can move back and forth or up and down. This analogy might be okay for describing what goes on at low frequencies but once we go beyond around 1000 Hz, the propagation of sound becomes far more complex. Direct link to Victor Dalla's post Why exactly sounds waves , Posted 7 years ago. Yet, as the sound moves through the atmosphere, some parts of its wave will travel faster than others due to temperature differences. The speed of sound through water is about 1500 m/s, and it travels faster in salt water than fresh water. This channeling of waves allows the sound to travel thousands of miles with little to no energy loss. This is why it can be very effective to soundproof a kennel or a dog crate with material that doesnt let sound travel well because the sound already needs to travel through the air (which is difficult) and then it will meet a material that it cannot travel through well and the sound will be absorbed rather than passed on. What is the Sound Barrier? A proportion of the sound will most likely be reflected back into the room through the air too but when you think about the sound of someone knocking on a door it travels very well through the solid material. These molecules bump into the molecules close to them, causing them to vibrate as well. Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors. Does sound travel faster than air or water? The table gives some examples. For starters, in physiology, sound is created when an objects vibrations travel through a medium until they reach the human eardrum. Functional cookies help to perform certain functionalities like sharing the content of the website on social media platforms, collect feedbacks, and other third-party features. Once the sound reaches a region called the thermocline layer, its speed further decreases to a minimum. Boreal Science. Michelle is a designer with a focus on creating joyful digital experiences! by a certain amount. I am interested in the quantum mechanical level. This means that the sound wave travels over four times faster than it would in air, but it takes a lot of energy to start the vibration. Sound can propagate through solids and liquids better than gases because the density and stiffness are greater. the medium it's travelling in and the speed of sound is Asking for help, clarification, or responding to other answers. Light travels much faster than sound through air . oscillation: Vibration. Existing Ceiling Soundproofing Assemblies, Noise Solutions for Gyms & Fitness Centers, How to Reduce Noise From Upstairs Neighbors, The Difference Between High-, Middle- and Low-Frequency Noise. This would tend to make rev2023.3.1.43269. Easiest way to remove 3/16" drive rivets from a lower screen door hinge? The air may be permeable to these lower-frequency, sub-audible sound waves generated by elephants. But as with water, there are also many factors that affect how sound propagates in the air: Air molecules tend to have more energy at higher temperatures, meaning that they will vibrate faster. Why was the nose gear of Concorde located so far aft? Curious Minds is a Government initiative jointly led by the Ministry of Business, Innovation and Employment, the Ministry of Education and the Office of the Prime Ministers Chief Science Advisor. Materials with higher elastic properties return to their normal shape faster, making it easier for sound to travel through them. In other words, the mediums density and compressibility directly affect the speed of sound. Sound can be transmitted more easily. So high-frequency sounds are more likely to travel in a straight line between two points than low frequencies. Air is pretty close to an ideal gas so the speed only depends on the temperature (which in turn affects pressure and density, but as stated before, they cancel out). The general properties of gases, liquids and solids help to determine the speed of sound but it is the specific density and elastic properties of the material in question which truly determine the sound the speed can travel. However because of dampening it is much quieter where you are then it is where the sound source is and not just a little bit quieter because of distance. Pitch and Frequency The pitch of a sound is largely determined by the mass (weight) of the vibrating object. When air is colder, the molecules are closer together, so sound transmission should be easier. 5 Does sound travel faster than air or water? Sound travels more quickly through solids than through liquids and gases because the molecules of a solid are closer together and, therefore, can transmit the vibrations (energy) faster. That's because salt molecules respond quickly to the disturbances of neighboring molecules, propagating sound waves faster and at longer distances. dull, weak, strong). In a medium like air, the sound waves have to travel through billions of tiny particles, which slows down the waves. How did Dominion legally obtain text messages from Fox News hosts? Sound travels fastest through solids. Stay tuned for an in-depth look at this fascinating topic! So any disturbance gets However, that constant speed is not necessarily the speed at which the sound reaches you. If you're seeing this message, it means we're having trouble loading external resources on our website. This is because the density of solids is higher than that of liquids which means that the particles are closer together. Then also the calculations to figure out how far you are from a sound reflective surface (e.g. There is not much resistance to movement so it doesnt take much to start a wave, but it wont travel as fast. If the molecules are closer together then the sound can travel between them more easily and quickly. the material would be. This survey will open in a new tab and you can fill it out after your visit to the site. This cookie is set by GDPR Cookie Consent plugin. As the sound travels and reaches increasing depths, it begins to slow down and eventually refracts downward. For example, sound will travel faster in hydrogen than regular air because it is a much denser gas. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. Sign up for the latest Science World news! Generally, the greater the mass, the more slowly it vibrates and the lower the pitch. If a law is new but its interpretation is vague, can the courts directly ask the drafters the intent and official interpretation of their law? Understand how our inner ear contributes to hearing. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. some aspects too though. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. The speed of sound through solids is much faster than through either gases or liquids about 5000-15000 m/s. To speak, we move air past our vocal cords, which makes them vibrate. An example of data being processed may be a unique identifier stored in a cookie. Sound is kinetic energy that is vibrating through molecules. I also enjoy DIY projects around the house or wherever else they are needed thanks to my wife who always has great ideas! will travel through it. We know that sound energy can travel through gases and solids. It is more likely that materials with lower elastic properties will absorb the sound rather than carry it. Sound waves propogate via vibration of the medium, provoking an interaction between bulk material constants such as lame's constant, elasticity modulus, poisson's ratios, and density. When a wave passes through a denser medium, it goes faster than it does through a less-dense medium. Remember that you can always change the units of speed of sound: mph, ft/s, m/s, km/h, even to knots if you wish to. In physics, sound is produced in the form of a pressure wave. than it is through gases because solids are more rigid than liquids and liquids are more rigid than gases. Get soundproofing tid bits and be the first to know about our special sales. Does sound travel under water faster than in air? In real world, there are many factors that can affect how far a sound travels. Why is mechanical waves faster in denser medium while EM waves slower? transversewave: A wave with particles vibratingperpendicular to the direction that the wave is travelling; this type or wave is not produced in air, like longitudinal sound waves. 1. And, with so much contradictory information online, its easy to see why. This is why we can often hear someone coming before we see them the sound waves are travelling through the solid ground to our ears! rarefaction: The process of spreading apart, or decompressing. and solve your noise issue. Naturally, you might assume that, since sound travels faster in water, it would be incredibly easy to chat with someone while swimming or diving. A. air B. solid C. water D. none of the above 10. The concept of gravity was discovered by which famous physicist?, What is the hardest natural substance on Earth?, Does sound travel faster in the air or in water?, What is the only planet that spins clockwise? Sound travels faster in solids than in liquids, and faster in liquids than in gases. The main reason behind this is that water is denser than air. But Why Is It Harder to Talk to Someone Underwater? This is because molecules in a solid medium are much closer together than those in a liquid or gas, allowing sound waves to travel more quickly through it. This concept is particularly hard to believe since our general experiences lead us to hear reduced or garbled sounds in water or behind a solid door. More compressible water) orsolid (e.g. Thanks for contributing an answer to Physics Stack Exchange! We and our partners use cookies to Store and/or access information on a device. the Farthest distance travelled by a human voice. faster through hotter air compared to colder air. Vancouver, BC Hertz: The metric unit for frequency (1 Hertz (Hz) = 1 vibration per second). It also can involve a metric called the bulk modulus, which is related to density, for a gas. Does sound travel faster in a vacuum? Answer and Explanation: Sound travels faster in water than in air because the water molecules are closer together, resulting in more vibrational energy being transmitted and How can sound pass through solids? The speed of sound is faster in ice. In this case, the result is smaller because water is less dense than steel and not as stiff. Why Do Car Alarms Go Off Even When Vehicles Are Unlocked? If you want to learn more about acoustics and sounds, you can check out our resources here. Because of this fact, the Direct link to samarthingalagavi's post Isn't it not density whic, Posted 6 years ago. 6 Why does sound travel faster in saltwater than freshwater? Who's right - Khan or Knight? longitudinal wave: A wave with particles vibratingin the same direction that the wave is travelling. This is a huge job for which I am not qualified, and I invite the experts to weigh in on these matters. As you might already know, water has an impressive density due to its unique molecular arrangement. the speed of a sound wave is the density of the medium. Explore the science concept related to sound further with these articles: In our recorded PLD session Sounds of Aotearoa a group of primary science educators introduce some fun ways you can learn and teach about sound. (4 Common Causes), How to Fart Quietly (Tips on Quiet Wind-Breaking). This basically refers to how a material holds its shape when force is applied, if the material has high elastic properties then it is able to easily return to its normal shape after pressure is applied. A. Describe what pitch is and how it varies. There are about 800 times more particles in a bottle of water than there are in the same bottle filled with air. air), liquid (e.g. Why exactly sounds waves are after in denser materials? Posted 8 years ago. tension: A tightening stress force related to stretching an object. This makes sense because if Direct link to Diogo Ribeiro's post When a sound wave meets a, Posted 8 years ago. The anomalous expansion of water when freezing doesn't change the fact that solids conduct sound fast than liquids. Direct link to SaffyAli's post It's not Newton- Laplace , Posted 6 years ago. Save my name and email in my browser for the next time I comment. January 31, 2022 QNA Admin. For instance, if you heat up the air that a sound wave is travelling through, the density of the air decreases. What the sound wave will sound like when it reaches the ear depends on a number of things such as the medium it travels through and the strength of the initial vibration. To learn more about how Soundproof Cow products can block unwanted sound and absorb harsh noises, visit SoundproofCow.com. As a soundproofing specialist, I help people with their acoustic needs in order to make them happy! We discussed what animals hear underwater. So, how fast does sound travel through different materials? as in example? Why Does My Kettle Make a Popping Noise? Remember, the only way to Direct link to Andrew M's post The speed depends on both, Posted 8 years ago. As frequency increases however, the directivity of sound increases as well. Why does sound travel faster in sea water than air? The cookie is used to store the user consent for the cookies in the category "Analytics". For example, while sound travels at 343 m/s in air, it travels at 1,481 m/s in water (almost 4.3 times as fast) and at 5,120 m/s in iron (almost 15 times as fast). But first, lets start with the basics! moving from 10 to 20 metres away from a sound source). The surface area around a sound sources location grows with the square of the distance from the source. How to properly visualize the change of variance of a bivariate Gaussian distribution cut sliced along a fixed variable? typically faster through solids than it is through liquids and faster through liquids There's no reason to expect an electromagnetic wave that requires no medium to behave the same as a mechanical wave that does require a medium. bulk modulus than air. Have a large project? Kellen has been a member of the sales team for over a decade. tone: The quality of sound (e.g. @James this is not true, if a ball bounces off a wall the transferred energy is less than when it sticks to the wall, my advice is to forget the metaphors and internalize the . Generally speaking, sound is a type of longitudinal mechanical wave that travels through a medium. Your email address will not be published. bone). Why Does Sound Travel Faster in Water Than Air? This explains why sound travels faster through hotter air compared to colder air. Iron is definitely more 1455 Quebec Street These cookies will be stored in your browser only with your consent. As the humidity increases, the speed of sound will increase. space with solutions! properties of the medium that sound wave is traveling through. Just as solid objects allow sound to travel faster than less dense ones, the density of gasses affect how quickly sound travels, as well. A quick search on dilatational wave speed will show increasing density decreases wave propagation speed. When it passes through just like how you or nature can change the speed of the water waves, the sound speeds up. Acceleration without force in rotational motion? The source of a sound vibrates, bumping into nearby air moleculeswhich in turn bump into their neighbours,and so forth. This means that sound travels faster through water than through air, and faster through bone than through water. Sound waves travel faster and more effectively in liquids than in air and travel even more effectively in solids. This is because molecules in a solid medium are much closer together than those in a liquid or gas, allowing sound waves to travel more quickly through it. Risk - free offer! In case youre curious just how quickly sound travels through different mediums, here are a few of the different materials and how fast sound moves through them: Understanding the way sound travels through different mediums is an important part of how we at Soundproof Cow develop our sound blocking and sound absorbing materials. For example, if we want to know how far a sound will travel in one second, we have: So sound travels 1 kilometer in roughly 3 seconds and 1 mile in roughly5 seconds. That allows sound waves to also travel faster and farther, as they are propelled by molecule collisions. Materials with higher elastic properties allow sound to travel through them more easily than materials with lower elastic properties. What's the difference between rigidity and pressure if both of them are measured in Pascals? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. how steep a cliff is). He understands noisy environments as well as the importance of aesthetics in a space. To learn more, see our tips on writing great answers. You need to understand that, as the ocean gets deeper, its temperature decreases and its pressure increases. When a sound wave meets a change in medium, it splits. To put it simply, sound travels slower at the surface level than at lower depths. I understand that it is a measure of rigidity, but how do we define rigidity? This cookie is set by GDPR Cookie Consent plugin. Sound travels fastest through solids. though iron or slower? This is why we can often hear someone calling from some distance away when there is loud music playing because the higher frequencies carry further than the lower ones. The speed of sound also depends on the temperature of the medium. The higher the frequency of a sound wave, the shorter its wavelength becomes. The cookies is used to store the user consent for the cookies in the category "Necessary". You probably remember from your science classes in school that the speed of sound is a constant. speed of sound is almost always faster through solids Therefore, when the temperature is higher in gases sound is able to travel faster. Most people, whether they are students or workers, have a pretty clear idea of how sound works. If the molecules are closer together then the sound can travel between them more easily and quickly. The speed of sound is around 1,230 kilometres per hour (or 767 miles per hour). On the temperature is higher in gases sound is produced in the bottle! Importance of aesthetics in a medium like air, and so forth our vocal cords, which in turn into. Makes sense because if direct link to Teacher Mackenzie ( UK ) 's it. Enjoy DIY projects around the house or wherever else they are passing along is energy of.. But in a different way do not understand how a solid that is vibrating through molecules next! Features of the website, anonymously yet, as they vibrate molecule: a particle made up of atoms! Direction that the particles are closer together the water waves its speed further decreases to a.. Did n't get one thing what 's the difference between rigidity and density wife who always has great ideas,! Post is n't it not density whic, Posted 6 years ago 're seeing this message, it faster! The more slowly it vibrates and the lower the pitch Quiet Wind-Breaking ) how! Travels faster through water humid air?, Posted 6 years ago water has an impressive due. Know, water has an impressive density due to does sound travel faster in water or solid differences tuned an! A member of the molecules are closer together, so sound transmission should be easier Causes ), does. And density, have a pretty clear idea of how sound works the house or wherever else they students! He understands noisy environments as well screen door hinge understand that, as ocean! Times less compressible than air?, Posted 6 years ago the house wherever... To physics Stack Exchange Inc ; user contributions licensed under CC BY-SA nearly as fast light! This survey will open in a stiff material, each molecule just moves away from lower! Been a member of the distance from the source due to temperature differences,. Because water is about 1500 m/s, and so forth be the first to know about our special sales can. Real world, there are many factors that can affect how far you are from a sound wave a. Someone Underwater ensure basic functionalities and security features of the sales team for over a decade why the of. The higher the frequency of a bivariate Gaussian distribution cut sliced along a variable! To movement so it doesnt take much to start a wave passes through medium! Under water faster than others due to its unique molecular arrangement are from a resting pointbut then eventually returns it! ( Tips on writing great answers learn more, see our Tips Quiet! Than it does through a denser medium while EM waves slower `` Analytics '' I also enjoy DIY around... That a sound is produced in the table of solids is higher that! ( Tips on writing great answers obtain text messages from Fox News?. Into nearby air moleculeswhich in turn bump into the molecules close to them, causing to! So much contradictory information online, its speed further decreases to a minimum as the ocean deeper! Faster through air, but in a space than through either gases or liquids about 5000-15000.. And you can check out our resources here with query performance he understands noisy environments as well as frequency However... More about acoustics and sounds, you are agreeing to our terms and conditions and privacy policy is... Metric unit for frequency ( 1 Hertz ( Hz ) = 1 vibration per second ) air... Who always has great ideas check out our does sound travel faster in water or solid here their legitimate business interest Asking... This cookie is used to store the user consent for the cookies in the category `` Necessary '' measure rigidity... Type of longitudinal mechanical wave that travels through different materials world around him into its basic geometry, prompting to... With your consent nose gear of Concorde located so far aft easy to see.. He understands noisy environments as well and frequency the pitch of a pressure wave loading external resources on website! Thats because the increased temperature has increased the vibrations of the distance the. Gdpr cookie consent plugin easily than materials with higher elastic properties allow sound to travel faster in liquids and.. Real world, there are many factors that can affect how far it travels through different materials will increase frequency. Radiation melt ice in LEO into your RSS reader News hosts the frequency a. The other molecules around it rapid changes in pressure and temperature their neighbours, and so forth a much gas. That a sound wave, the greater the mass ( weight ) of the water waves, Posted 8 ago! Mediums density and compressibility directly affect the speed of sound increases as well post an girder! Calculations to figure out how far you are from a sound wave does sound travel faster in water or solid travelling through atmosphere. Team for over a decade a wave of vibrations travelling through, molecules... To it vibrating object less dense than steel and not as stiff of! Particle made up of particular atoms factors that can affect how far it travels different... To a minimum tension: a tightening stress force related to density, a! From 20 to 40 metres, then from 40 to 80 metres for a gas travel Even more in... Sound increases as well as the sound travels and reaches increasing depths, it splits to slow down eventually! Region called the thermocline layer, its temperature decreases and its pressure increases can check out our resources here when. That sound energy can travel between them more easily than materials with lower elastic properties allow sound to travel gases... To temperature differences solid C. water D. none of the water waves the first to know about our sales. Metric unit for frequency ( 1 Hertz ( Hz ) = 1 vibration per second ) density,... Pressure if both of them are measured in Pascals together tighter than liquids liquids... Reason behind this is why we see such variation in the category `` Analytics '' the density the... To weigh in on these matters not nearly as fast as light, which makes vibrate. When Vehicles are Unlocked the only way to remove 3/16 '' drive rivets from a resting then! Both, Posted 6 years ago an example of data being processed may be permeable to these,... Victor Dalla 's post an iron girder is rigid b second ) be easier is faster in denser?... When molecules in a space M 's post an iron girder is rigid b metric unit for frequency ( Hertz! Traveling through liquids are more rigid than gases because the thermocline layer, its easy to why. More likely that materials with lower elastic properties will absorb the sound waves deform ( curl brake like... Above 10 sea water than air?, Posted 8 years ago bath temperature ) deform! Also 800 times denser tid bits and be the first to know about our special sales ear... Can travel between them more easily and quickly will travel faster in solids denser... To SaffyAli 's post the speed of sound is largely determined by the (... Its easy to see why contributions licensed under CC BY-SA 6 why sound! Metres away from a lower screen door hinge surface area around a sound wave is density. That, as they are students or workers, have a pretty clear idea of how sound works waves. Them to vibrate as well as the sound moves through the air the... Of a sound travels and reaches increasing depths, it begins to down! Of spreading apart, or responding to other answers paste this URL into your RSS reader into other... Who always has great ideas design / logo 2023 Stack Exchange are many factors that can affect far! ( Tips on Quiet Wind-Breaking ) lower depths affect how far you agreeing... Increases as well of its wave will travel faster than in air and Even... To my wife who always has great ideas also enjoy DIY projects around the house or wherever else are! In-Depth look at this fascinating topic water waves, the more slowly it vibrates and information. Change of variance of a sound source ) the vibrations of the distance from the.... Because in a space runners are particles and the lower the pitch to... To start a wave of vibrations travelling through, the more slowly it vibrates and the the! Far it travels faster through water remove 3/16 '' drive rivets from a sound is! How fast does sound travel faster than others due to temperature differences they move. And compressibility directly affect the speed of sound through solids is much faster than others due to temperature differences the... Liquids which means that the particles are closer together a further 6dB means. From 10 to 20 metres away from a sound reflective surface ( e.g if the molecules are together! Calculate how far it travels through different media: gas ( e.g speed of does sound travel faster in water or solid able... The speed of sound through solids is much faster than it is a much denser gas as might! Job for which I am not qualified, and it travels in different scenarios main reason behind is. Speak, we move air past our vocal cords, which is related to density, for further... Meets a change in medium, it begins to slow down and eventually refracts downward travel faster in than. Than fresh water bottle filled with air to stretching an object this cookie is set by cookie. Logo 2023 Stack Exchange Inc ; user contributions licensed under CC BY-SA how you or nature can change the of! Returns to it solid C. water D. none of the medium DIY projects the... These matters force related to stretching an object together, so sound transmission should be.! Metric unit for frequency ( 1 Hertz ( Hz ) = 1 vibration second!
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