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Reflection of Sound

An echo of th...

Question

An echo of the sound produced can be heard only if it reaches our ear after -

A

1 / 15th of a second

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B

1 / 13th of a second

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C

1 / 10th of a second

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D

1 / 5th of a second

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Solution

The correct option is C 1 / 10th of a second
An echo is the repetition of sound that results as a reflection from a surface. An echo of the sound produced can be heard only if it reaches our ear after 1 / 10th of a second. This is due to the persistence of sound.

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