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 $340\mathrm{ms}^{-1}$, h...

Assessment: JAMB UTME - Physics - 2021 Subject: Physics

Question 1 Report

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 $340\mathrm{ms}^{-1}$, how far is he from the cliff?

680m

170m

34m

85m

Answer Details

V = $\frac{2 d}{t}$
v = 340ms $^{- 1}$
t = 0.5s
d= ?

d = $\frac{2 d}{2} = \frac{340 \times 0.5}{2}$ = 85m

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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 \(340\mathrm{ms}^{-1}\), h...

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