What is the rate of absorbtion of sound?

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Offline Atomic-S

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What is the rate of absorbtion of sound?
« on: 14/06/2014 04:36:14 »
In which medium will sound of a given wavelength travel farther before losing half its energy: a gas at low pressure, or the same gas at the same temperature but a higher pressure?

[MOD EDIT- please phrase subjects as questions in line with AUP]
« Last Edit: 18/06/2014 16:49:21 by Georgia »
 

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Offline evan_au

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Re: Rate of absorbtion of sound
« Reply #1 on: 15/06/2014 03:49:41 »
The attenuation of sound is lower when the gas is at a higher pressure.

This can be seen in Stokes' Law: when the density ρ is lower, the attenuation α is higher.

When the gas pressure is so low that the distance between molecular collisions is roughly the wavelength of the sound, attenuation gets very high.

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Offline yor_on

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Re: Rate of absorbtion of sound
« Reply #2 on: 16/06/2014 18:48:25 »
Or, where does sound travel faster, in air or in the sea?

http://www.waterencyclopedia.com/Re-St/Sound-Transmission-in-the-Ocean.html
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Offline Atomic-S

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Re: Rate of absorbtion of sound
« Reply #3 on: 18/06/2014 07:22:38 »
Sound travels faster in water than in air.