Question

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 ms velocity of sound in water = 1450 mx

Answer 1

sound will take 0.68 sec to reach the diver.

Explanation :

Given speed of sound in air = 330 m/s

Speed of sound in water = 1450 m/s

Time taken by sound to reach boatman = 3 sec

we know that ,

distance  = speed x time

=> distance of boatman = 330 x 3 = 990 m

since the diver is at the same depth ,

=> depth of diver = 990 m

=> time taken = 990/1450 = 0.68 sec

Hence sound will take 0.68 sec to reach the diver.

Answer 2

Answer:

The sound will take 3.68 seconds to reach the diver.

Explanation:

Depth of Diver = V×t = 330× 3 = 990m

Time taken by sound in water = d/v = 990/1450 = 0.68 s

So total time = 3 + 0.68 = 3.68 seconds.

Hope it helps !!!