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 sometime after the direct sound.For hearing distinct echoes, the minimum distance of the obstacle from the source of sound must be around 17 m.Therefore, 'Reflection of sound' is the correct response.

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What is an echo?

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It is the reflection of sound.

It is the incidence of sound.

Vibration of sound

It is the refraction of sound.

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 sometime after the direct sound.
For hearing distinct echoes, the minimum distance of the obstacle from the source of sound must be around 17 m.

Therefore, 'Reflection of sound' is the correct response.

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