A girl standing some distance from the cliff claps her hands and hears the echo...

WAEC 2015

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

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Correct Answer: Option B

Explanation

V = \(\frac{2nx}{E}\)

= \(\frac{2 \times 1 \times X}{0.8} = 320\)

2x = 0.8 x 320

x = \(\frac{0.8 \times 320}{2}\)

= 128m

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A girl standing some distance from the cliff claps her hands and hears the echo...

Correct Answer: Option B

Explanation

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