A sound wave travelling in air is made to propagate through a liquid such that the velocity of sound is quadrupled. If the frequency of the sound wave is constant, find the change in the wavelength of the sound wave.

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Solution

This is very simple
We know that $v = f λ$ where symbols have usual meaning.
If $v$ has become $4 v$ and $f$ is as it is, then obviously $λ$ should become $4 λ$

The wavelength has increased to four times.

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A sound wave travelling in air is made to propagate through a liquid such that the velocity of sound is quadrupled. If the frequency of the sound wave is constant, find the change in the wavelength of the sound wave.

This is very simpleWe know that v=fλ where symbols have usual meaning.If v has become 4v and f is as it is, then obviously λ should become 4λThe wavelength has increased to four times.

This is very simple
We know that $v = f λ$ where symbols have usual meaning.
If $v$ has become $4 v$ and $f$ is as it is, then obviously $λ$ should become $4 λ$

The wavelength has increased to four times.