Question

A child hears an echo from a cliff 6 seconds after the sound is produced. How far away is the child? (take speed of sound as 344m/)​

Answer 1

Answer:

Velocity of sound in air v=344 m/s

Let the distance between the cliff and the child be x.

The sound has to travel to the cliff and get reflected back to the child itself, thus total distance travelled by the sound is 2x.

Time taken to hear an echo t=4 s

So, 2x=vt

Or 2x=344×4

⟹ x=688 m

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