A man stands 25m from a high wall. He hears an echo off the high wall, produced by blowing whistle. If the velocity of sound in air is 330m/s. What will be the time interval between sound produced by whistle and hearing an echo? (pls show methods)
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Answer: v=330m/s
total d =2d =25*2=50
t=d/s
50/330=0.15s
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