A boy standing a distance from the foot of a tall cliff claps his hands...

WAEC 1988

A boy standing a distance from the foot of a tall cliff claps his hands and hears an echo 0.5s later. If the speed of sound is 340ms1, how far is he from the cliff?

A. 17m
B. 34m
C. 85m
D. 170m
E. 680m

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Correct Answer: Option C

Explanation

X = vt/2 = (340 x 0.5)/2 = 85m

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A boy standing a distance from the foot of a tall cliff claps his hands...

Correct Answer: Option C

Explanation

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