A boy standing in front of wall at a distance of `85 m` produces `2` claps per second. He notices that the sound of his clapping coincides with the echo. The echo is heard only once when clapping is stopped. Calcualte the speed of sound.

A boy standing in front of wall at a distance of `85 m` produces `2` c

1.	A boy standing in front of wall at a distance of `85 m` produces `2` claps per second. He notices that the sound of his clapping coincides with the echo. The echo is heard only once when clapping is stopped. Calcualte the speed of sound.
Answer» Here, distance of the boy from the wall, `d = 85 m` time taken by the echo to be heard, `t = (1)/(2) s = 0.5 s` If `d` is distance between the boy and the wall, total distance travelled by sound in going and coming back `= 2 d` As distance travelled by sound = speed of sound xx time, `2 d = v t` or `v = (2 d)/(t) = (2 xx 85)/(0.5) = 340 m//s`.

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A boy standing in front of wall at a distance of `85 m` produces `2` claps per second. He notices that the sound of his clapping coincides with the echo. The echo is heard only once when clapping is stopped. Calcualte the speed of sound.

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