Physics
A man standing 48 m away from a wall fires a gun. Calculate the time after which an echo is heard. (The speed of sound in air is 320 ms-1).
Sound
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Answer
As we know,
Total distance travelled by the sound in going and then coming back = 2d
Given,
d = 48 m
V = 320 ms-1
Substituting the values in the formula above, we get,
Hence, time after which echo is heard = 0.30 s.
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