Question

We cannot hear the echo produced
in a classroom.​

Answer 1

Answer:

because there should be minimum distance of 17.1 m

Answer 2

Answer:

The distance between two walls of a classroom is less than 17.2 m. Therefore the time taken for the echo to reach our ears is less than 0.1 s. Thus we are unable to distinguish between the original sound and the echo produced. Hence echo can't be heard in a classroom.

Explanation:

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