A boy claps and hears the echo after 4 seconds. If he is 320 m away from the cliff, calculate the velocity of sound in air.
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Answer:
Given, Speed of sound, v=346ms−1 Time taken for hearing the echo, t=4s
Distance travelled by the sound =v×t=346m/s×4s=1384m
In 4 s sound has to travel twice the distance between the cliff and the person.
Hence, the distance between the cliff and the person =1384m/2=692m
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Explanation:
Time to hear echo of sound of clapping=4sec
Distance between the boy and the cliff=320m
Velocity of sound=Distance/Time
=320/4=80m/sec.
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