Question

Rahul could hear an echo in a empty room but could not hear it in a room where there are people.why?

Answer 1

To listen to an echo. The distance between the source of the sound an the reverberating medium shoulder be of more than 17.2ms.. This is not possible in a crowded place as people are in the middle and near to you.
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Answer 2

beacuse in a place without any other forces an without other sounds you can her it but when there is a lot of dofferent sounds it become harder to hear