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A man stands on top of a cliff and shouts.
He hears the echo on the third clap when
he claps his hand at the rate of two claps
per second. What is the distance between
man & the obstruction, if the velocity of
sound is 320 m/s
[IOM 98]
a. 320
b. 460
c. 640
d. 160​

Respuesta :

DeanR

From the story the echo is a delay of one second, so half a second there, half a second back.

d = vt = (320 m/s)  (1/2  s) = 160 m

Answer: d, 160 meters

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