Question

consider the speed of sound in water as 1500m/s how far from an under sea rock a deep sea diver be to hear an echo in 3 seconds
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Answer 1

Answer:

2,250

Explanation:

The sensation of sound persists in our brain for about 3 s. That is, to a hear a distinct echo the minimum time interval between the original sound and the reflected sound = 3s.

Speed of sound in water is given as 1500 m/s.

Here, the sound must go to the obstacle and reach back the ear of the listener on reflection after 3ss.

Hence, the total distance covered by the sound from the point of generation to the reflecting surface and back = 1500 * 3= 4500 m.

Thus, for hearing the echo, the minimum distance of the rock from the deep sea diver for him to hear his echo must be half of this distance. That is, 2,250 m.

Answer 2

Answer:

2,250 speed echo in 3 second