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Q.

When we clap in front of a cliff or mountain, we hear the double clapping sound. This phenomenon is called


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a

Reverberation

b

Persistence

c

Echo

d

amplitude 

answer is C.

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Detailed Solution

The sound gets reflected back to us when we clap in front of a cliff or mountain. This phenomenon is called Echo.
An echo is produced due to the reflection of sound from a surface. We can hear an echo if the reflecting surface is beyond a specific distance from the sound source. The minimum distance required to hear an echo is 17.2 m.
 
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