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11 June, 16:42

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

+4
Answers (1)
  1. 11 June, 18:19
    0
    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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Home » Physics » 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.
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