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Question 1

An echo returned in 3 s. What is the distance of the reflecting surface from the source, given that the speed of sound is 342 m s-1?

Answer

Speed of sound, v = 342 m/s

Time taken by sound to travel from the source to reflecting surface, t = 3/2 = 1.5 s

Distance travelled by sound to reflecting surface from the source = v × t = 342 × 1.5  = 513 m

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