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We cannot hear an echo produced in a classroom.

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Our classrooms are mostly constructed in a such way that the distance between two walls of the classroom would be less than 17m. When there is sound produced in classroom that reflects from the walls of the classroom and reach to our ear in 0.1 second only. Due to this very small time we can’t distinguish the sound produced originally and the sound reflected. Due to which we can say that in classrooms there will be no echo produced

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