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# Form 2 Physics Sound Questions and Answers

A student stands at a distance 400m from a wall and claps two pieces of wood. After the first clap the student claps whenever an echo is heard from the wall. Another student starts a stopwatch at the first clap and stops it after the twentieth clap. The stopwatch records a time of 50 seconds. Find the speed of sound.

(1m 43s)
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Speed = (2d)/t= (2times400)/2.5 = 320m/s.