PhysicsSound wavesWAEC
A girl claps in front of a wall and hears the echo 1.2 s later. If sound travels at 340 m/s, how far is the wall?
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Answer: D. 204 m
The sound goes there and back: 2d = 340 × 1.2 = 408 m, so d = 204 m.
An AdmitMe practice question, written for the WAEC syllabus. Not an official past question.