A boy standing some distance from a cliff claps his hands and hears the echo $2$ s later. If the speed of sound in air is $340$ m s$^{-1}$, how far is he from the cliff?

Question

Accepted Answer

$340$ m. The sound travels to the cliff and back, a total distance of $340 	imes 2 = 680$ m, so the distance to the cliff is $\dfrac{680}{2} = 340$ m. Forgetting that the sound makes a return journey gives 680 m.

Answer

A) $680$ m

Answer

B) $85$ m

Answer

C) $170$ m

Answer

D) $340$ m

A boy standing some distance from a cliff claps his hands and hears the echo $2$ s later. If the speed of sound in air is $340$ m s$^{-1}$, how far is he from the cliff?

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