Question

A man standing 825 M away from a cliff strip Rock fire a gun after how how long will he hear it's Eco? speed of a sound in air is 330 M per second

Answer 1

Given
Distance of the man from the cliff= 825m
Speed of sound in air= 330m/s
Let the time taken be 't'
Distance covered by the sound wave=2×825
=1650
Time taken = Distance covered / Time taken
=> t = 1650/330
=> t = 5 sec

Answer 2

The time taken he will hear the echo is 5 seconds.

Explanation:

Given that,

A man standing 825 M away from a cliff strip, d = 825 m

The speed of sound in air, v = 330 m/s

The total distance covered by the covered by the echo will be 2d, 1650 m. The speed of sound is given by :

$v=\dfrac{d}{t}$

$t=\dfrac{d}{v}$

$t=\dfrac{1650\ m}{330\ m/s}$

t = 5 seconds

So, the time taken he will hear the echo is 5 seconds.

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