Question

A man shouts loudly close to high wall he hears an echo if the man is at 40m from how long after the shout will the echo be heard

Answer 1

After 0.24 seconds shout will the echo be heard.

Explanation:

Given that,

Distance at which the echo is heard, d = 40 m

To find,

How long after the shout will the echo be heard.

Solution,

We know that the speed of sound in air is 330 m/s. To heard echo, the total distance covered by the sound is 2d. The time taken is given by :

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

$t=\dfrac{2d}{v}$

$t=\dfrac{2\times 40\ m}{330\ m/s}$

t = 0.24 seconds

So, after 0.24 seconds shout will the echo be heard.

Learn more,

Echo

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Answer 2

ans for this question is 0.24