Q.

What is echo?

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a

It is the refraction of sound.

b

It is the reflection of sound.

c

It is the incidence of sound.

d

None of above

answer is B.

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Detailed Solution

An echo is a sound caused by the reflection of sound waves from a surface back to the listener. It is the reflection of sound, arriving at the listener some time after the direct sound.

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What is echo?