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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
  • E. 366.67m
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Correct Answer: Option C
Explanation
v = 2x/t ∴ distance x = vt/2 = 148.5m
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