a boy claps and hears a echo after reflection from a wall which is 680m away from him. If the velocity of sound is 340 m/s calculate the time taken for hearing the echo.
3 marks please ans neatly
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Explanation:
distance between him and wall is=680m
speed of sound =340m/s
total distance travelled by sound =680+680
=2*680m
time=distance/speed
time=2*680/340 s
time=4s
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