Physics WAEC

A girl standing some distance from the cliff claps her hands and hears the echo 0.8s later. calculate her distance from the cliff. [speed of sound in air = 320 ms‾¹]

A. 23m
B. 128m
C. 288m
D. 298m

Correct Answer: Option B

Explanation

V = 2nxE

= 2×1×X/0.8 = 320

2x = 0.8 x 320

x = 0.8×320/2

= 128m

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