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Speed of sound waves in various media.

by Manraj singh
Tags: media, sound, speed, waves
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Manraj singh
#1
Feb20-14, 09:04 AM
Manraj singh's Avatar
P: 62
My tenth grade physics textbook says that sound travels faster in solids than air. But it also says sound will travel faster in air if its density decreases. I didn't really get the logic, as solids are denser than air, and that is why sound travels faster. Then they say as temperature of air increases , sound will travel faster in it as its density decreases. Can anyone please explain this? They have also given this formula: Velocity of sound Click image for larger version

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ID:	66824= root of elasticity divided by root of density of medium.
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pondzo
#2
Feb20-14, 09:36 AM
P: 66
according to the given equation, V= √(E/d) a lower density will give you a bigger number under the radical and hence a bigger velocity.

but in regards to your confusion of higher density = faster speed of sound and lower density = lower speed of sound - this is untrue, its not the density is not directly proportional to the speed of sound, but the tension is directly proportional to the speed of sound, here is a thread that discusses in more detail: http://www.physicsforums.com/showthread.php?t=206667
Manraj singh
#3
Feb20-14, 10:11 AM
Manraj singh's Avatar
P: 62
Thx. That helped a lot.


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