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
Correct Answer: Option C
Explanation
X = vt/2 = (340 x 0.5)/2 = 85m