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?

by | Sep 2 | Physics WAEC | 0 comments

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

Correct Answer:

Option C – 85m

Explanation

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