(A) : The wave length of sound waves increases when they are refracted from air into water
(R) : Velocity of sound is greater in water than in air

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(A) is true but (R) is false

Both (A) and (R) are true but (R) is not the correct explanation of (A)

Both (A) and (R) are true and (R) is the correct explanation of (A)

Both (A) and (R) are false

answer is A.

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Detailed Solution

In comparison to air, water has a higher sound velocity. Therefore, as sound waves are refracted from air into water, frequency doesn't change, so their wavelength increases.

$v = λ f$

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