How far from a cliff should a boy stand in order to hear the echo...
PHYSICS
WAEC 1992
How far from a cliff should a boy stand in order to hear the echo of his clap 0.9s later? (Speed of sound in air = 330 ms-1)
- A. 36.67m
- B. 74.25m
- C. 148.50m
- D. 297.00
Correct Answer: C. 148.50m
Explanation
v = 2x/t ? distance x = vt/2 = 148.5m
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