Question

we cannot hear the echo produced in a classroom

Answer 1

the class is filled with benches and tables which are made out of wood. wood are good Absorbers of sound. this is the reason why we cannot hear the echo produced in a classroom.

Answer 2

well the answer of this question will be that as a lot of students are always present in class and as echo occurs in open area only and in class it is always crowded everywere so its not possible
hope it helps you
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