# The person heard the echo of the sound sent to the reservoir after 4 seconds. What is the depth of the reservoir?

The person heard the echo of the sound sent to the reservoir after 4 seconds. What is the depth of the reservoir? The speed of sound in water should be taken equal to 1450 m / s

We write down the depth of the reservoir with a formula and substitute the known values into it. The sound will travel from the surface of the reservoir to its bottom and back, which means:

H = S / 2 = V * t / 2,

Where

H is the depth of the reservoir;

S is the path traveled by sound;

V is the speed of sound propagation;

t is the time spent by sound when passing through water.

H = 1450 * 4/2 = 2900 m.

2900 m = 2.9 km.

Answer: the depth of the reservoir is 2.9 km.

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