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An echo is heard in 3s. What is the distance of the reflecting surface from the source, given that the speed of sound is 342 ms–1?
Speed of sound in air = 342 m/s
Time to hear the echo = 3 s
Distance from the source to the reflecting surface,
2d = v x t
d = (v x t) / 2
d = (342 x 3) / 2
d = 513 m
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