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A boy standing a distance from the foot of a tall cliff claps his hands...

Physics
WAEC 1988
A boy standing a distance from the foot of a tall cliff claps his hands and hears an echo 0.5s later. If the speed of sound is 340ms1, how far is he from the cliff?
  • A. 17m
  • B. 34m
  • C. 85m
  • D. 170m
  • E. 680m
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Correct Answer: Option C
Explanation
X = vt/2 = (340 x 0.5)/2 = 85m
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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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