Question

2. For hearing echo, the minimum distance between the reflecting surface and the source of sound must be a) 34.4 b) 17.2 c) 32.2 d) 17.4​

Answer 1

Answer:

To hear an echo, the minimum distance between source of sound and reflecting body is 17m.

Answer 2

Answer:

17.2 must be the distance between the reflecting surface and the source :)