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A sound is produced in water and moves towards the surface of the water and some sound moves in air. Velocity of sound in water is 1450 m/s and that in air is 330 m/s. When sound moves from water to air then the effect on frequency f and wavelength $λ$ will be

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f will remain same but $λ$ will increase

f will remain same but $λ$ will decrease

f will increase and $λ$ will decrease

f and $λ$ will remain same

answer is C.

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Detailed Solution

Frequency does not depends upon medium, velocity of sound decreases when it goes from water to air. $v = f x (∵ f = c o n s t .)$
So $λ$ also decreases.

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