What happens to wavelength of sound in liquid?

AI Thread Summary
The speed of sound is greater in liquids than in air, leading to a change in wavelength while frequency remains constant for a given object. As the speed of sound increases in a liquid, the wavelength also increases due to the relationship defined by the equation velocity = wavelength x frequency. The molecular explanation for this increased speed involves the bulk modulus, which is higher in liquids due to stronger intermolecular interactions and reduced intermolecular space. Therefore, while frequency stays the same, the increase in speed results in a longer wavelength in liquids. Understanding these principles clarifies how sound behaves differently in various mediums.
hasankamal007
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We know that speed of sound in liquid is more than in air.
Also, velocity of sound = wavelength X frequency.

Now there's a change in speed of sound from air to liquid, so, wavelength or frequency should have got changed...

But, generally, frequency won't change for an object (correct me if I'm wrong).
So there should be a change in wavelength...
My question is how? The reason?
(Please try to explain also at molecular level)
Thanks.
 
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You answered your question already. The wavelength increases because the speed of sound increases. I don't see what you mean by explanation at "molecular level" for this.
The wavelength is the distance traveled during the time required for the phase to change by 2pi. Nothing to do with molecules.

If you are looking for an explanation for the increased speed of sound, then you may look at molecular level. The speed is larger in water due to larger bulk modulus (or decreased compressibility). This can be attributed in part to stronger intermolecular interactions and reduced intermolecular space.
 

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