Question

A man claps his hand near a mountain and hears the echo after 4second. If the speed of sound under these conditions be 330m/s, what is the distance of mountain from the man

Answer 1

Time taken by sound to reach mountain = 4/2 = 2 sec
Distance of mountain from man = 2 *330
= 660 m
= 0. 66 km

Answer 2

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Let the distance between the ship and the enemy submarine be ‘S’.

Speed of sound in water = 1450 m/s

Time lag between transmission and reception of Sonar waves = 77 s

In this time lag, sound waves travel a distance which is twice the distance between the ship and the submarine (2S).

Time taken for the sound to reach the submarine

=1/2 × 77 =38.5 s

Distance between the ship and the submarine (S) = 1450 × 38.5 = 55825 m = 55.8 km

I hope, this will help you

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