Question

what should be the dimensions and the shape of classroom so that no echo can be produced there​

Answer 1

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For no echo to be produced in a classroom, the classroom should be square shaped with distance between the walls to be less than 17.2 m. Also, the ceiling should be curved shaped so that the reflection of sound wave is uniform throughout the room.

Answer 2

Answer: It should be half of 34.4 that is 34.4/2= 17.2

Explanation: For no echo to be produced in a classroom, the classroom should be square shaped with distance between the walls to be less than 17.2 m. Also, the ceiling should be curved shaped so that the reflection of sound wave is uniform throughout the room.