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A person clapped his hands near a cliff and heard an echo after 5s. What is the distance of the cliff from the person if the speed of the sound is taken as 346 m/s?

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300 m

865 m

1500 m

1730 m

answer is B.

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Detailed Solution

Given,
Speed of sound, v = 346 m/s
Time is taken for hearing the echo, t = 5 s
Distance travelled by the sound: velocity x time
Distance = v x t = 346 x 5 = 1730 m

The echo has to travel twice the distance between the cliff and the person.

Hence, the distance between the cliff and the person $\frac{1730 m}{2} = 865 m$ .

Therefore, 865 m is the correct response.

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