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 $= 330 m s^{- 1}$ .
Velocity of sound in water $= 1450 m s^{- 1}$ .

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Solution

Depth of lake $= v \times t$
$= 330 \times 3$
$= 990 m$
Time taken by sound in water to reach the diver $= \frac{990}{1450}$
$= 0.68 s e c$ .

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A sound made on the surface of a lake takes 3s 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.

Depth of lake =v×t =330×3 =990mTime taken by sound in water to reach the diver =9901450 =0.68sec.

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 $= 330 m s^{- 1}$ .
Velocity of sound in water $= 1450 m s^{- 1}$ .

Depth of lake $= v \times t$
$= 330 \times 3$
$= 990 m$
Time taken by sound in water to reach the diver $= \frac{990}{1450}$
$= 0.68 s e c$ .