What happens to wavelength of sound in liquid?

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    Liquid Sound Wavelength
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SUMMARY

The speed of sound in liquids is greater than in air, leading to an increase in wavelength while frequency remains constant. The relationship between speed, wavelength, and frequency is defined by the equation: velocity of sound = wavelength × frequency. The increase in speed of sound in water is attributed to a higher bulk modulus and reduced compressibility, resulting from stronger intermolecular interactions and decreased intermolecular space. Understanding these principles clarifies how sound behaves differently in various mediums.

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  • Understanding of the wave equation: velocity = wavelength × frequency
  • Knowledge of bulk modulus and compressibility in materials
  • Familiarity with sound propagation in different mediums
  • Basic concepts of molecular interactions and structures
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  • Research the properties of bulk modulus in various liquids
  • Explore the effects of temperature on sound speed in water
  • Study the molecular structure of water and its impact on sound propagation
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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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