Categories: Physics JAMB

A boy standing some distance from the foot of a tall cliff claps his hands and hears an echo 0.5s later. If the speed of sound is 340ms‾¹, how far is he from the cliff?
A boy standing some distance from the foot of a tall cliff claps his hands and hears an echo 0.5s later. If the speed of sound is 340ms‾¹, how far is he from the cliff?A boy standing some distance from the foot of a tall cliff claps his hands and hears an echo 0.5s later. If the speed of sound is 340ms‾¹, how far is he from the cliff?

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

Correct Answer:

Option D = 85m

Explanation

V = 2d/t
v = 340ms−1
t = 0.5s
d= ?

d = 2d/2=340×0.52 = 85m

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