an echo of a sound is heard after 3seconds.find the distance of the reflecting surface from the source if the speed of sound is 340m/s
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28.8 distance is the answer the formula of distances =speed \ time
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t = 3 sec
v = 340 m/s
2d = v × t
= 340 × 3
= 1020 m
d = 1020 ÷ 2
= 510 metres
distance of the reflecting surface fro the source = 510 m
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