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# Form 2 Physics Sound Questions and Answers

A mine-worker stands between two vertical cliffs 400m from the nearest cliff. The cliffs are x distance apart. Every time he strikes the rock once, he hears two echoes; the first one after 2.5 seconds, while the second follows 2 seconds later. From this information, calculate
i).The speed of the sound in air.
ii).The value of x.

(4m 6s)
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i).Speed = (2d)/t = (2 times 400)/2.5 = 320 m/s
ii).Distance = s times t
2(x – 400) = 320 times4.5