A girl standing some distance from the cliff claps her hands and hears the echo...
PHYSICS
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
Correct Answer: B. 128m
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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