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Echo

A source of s...

Question

A source of sound is kept at a distance of 10 m from a wall. What distance should it be moved further, so that an echo is heard

A

10 m away from the wall

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B

7 m away from the wall

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C

7 m towards the wall

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D

10 m towards the wall

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Solution

The correct option is B 7 m away from the wall
To hear an echo, the distance between the source and the reflector should be atleast 17 m. Thus the source should be moved 7 m away from the wall
The correct option is (b)

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