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in Physics by (69.9k points)

A sound made on the surface of a lake takes 3 s to reach a boatman. How much time will it take to reach a diver inside the water at the same depth? 

[Velocity of sound in air = 330ms-1; Velocity of sound in water = 1450ms-1

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Distance covered by the sound to reach boatman = 330ms-1 × 3s = 990 m 

∴Distance of diver from the source of sound = 990m 990m 990 _ 

∴Time taken by the sound to reach diver = 1450ms-1” 145s = 0.68s (Appox.).

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