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Speed of Sound

A source of s...

Question

A source of sound moves with an uniform velocity away from a wall. An echo is heard at 4th second from its beginning position, what is the speed of the source

A

10 m/s

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B

7 m/s

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C

4.25 m/s

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D

1 m/s

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Solution

The correct option is C 4.25 m/s
distance moved by the source = 17 m for the echo to be heard
Thus, $17 = v (4) ⟹ v = 17 / 4 = 4.25$ m/s
The correct option is (c)

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