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Q.

Pawan is singing a song in an empty cave, but it seems that another man is singing the same song, just repeating after him, as he hears the song more than once. This is due to the phenomenon called [[1]].


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Detailed Solution

This is due to the phenomenon called echo.
Sound waves that are reflected off a surface and returned to the listener are called an echo. The listener hears it sometime after the direct sound because it is the reflection of sound. This is why Pawan hears two sounds one after another in the cave.
 
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