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 Form 2 Physics Sound Questions and Answers

A soldier standing some distance from a wall, blows a whistle and hears its echo 1.8 seconds later. How far is the wall from the soldier? (Speed of sound in air is 330m/s).

 (1m 19s)
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Answer Text:
#2d = s times t=330 times1.8#
#d =(330 times1.8)/2 = 297m#