How does sound propagate in the phone placed in an empty beaker ringing sound heard?
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How does sound propagate in the phone placed in an empty beaker ringing sound heard?
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How well do you know your eardrums? You probably know that your eardrum is an essential part of your ear, allowing you to hear the world around you. But why do we call it a drum? It turns out that calling it a drum is a very accurate description of what your eardrum looks like—and what it does inside your ear. To understand how your eardrum works, imagine using a drumstick to bang on a real drum, and then touching the drum with your hand. When you do this, you can feel the vibrations moving through the drum material. Our eardrums work in a similar way, but instead of from the beat of a drumstick, our eardrums vibrate in response to sound waves hitting it. We can't see these sound waves with our eyes. But we can see how they cause vibrations in things around us, just as they do in our eardrums!What we experience as sound is actually a mechanical wave, produced by the back-and-forth vibration of particles in the air (or whatever medium is around our ears—remember sound travels through water, too!). To understand this, imagine (or try) clapping your hands underwater. As your hands move toward each other they gather water, creating a space behind them that the surrounding water particles rush to fill. Once your hands meet, the water particles between your hands are squashed together. You can see the result both of these events as ripples moving away from your clapped hands through the water. Sound waves travel through air in a similar way. When you clap your hands, you displace (or move) the air particles between and around your hands. This creates a compression wave that travels through the air (much like it did in the water). A continuous sound (such as the one produced by a tuning fork) is caused by the vibrations of the fork tines. The tines’ vibrations repeatedly compress and displace the air particles around them, causing a repeating pattern of compressions that we hear as a single, continuous tone. The faster the tines move, the less time there is between each compression, causing a higher-frequency sound wave.
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