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 Form 2 Physics Sound Questions and Answers

The human ear can distinguish two sounds as separate only if they reach it at 0.1 seconds apart. How far from a wall must an observer be in order to hear an echo when he shouts? (Speed of sound in air 330m/s)

 (1m 37s)
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Answer Text:
#2d = s times t#
d=# (330 times0.1)/2#