The minimum distance between source of sound and reflection surface for the clear hearing of sound is

Choose the correct option? The minimum distance between the source of sound and reflection surface for the clear of hearing of sound is A. 17.2 m B. 20 m C. 1.7 m D.19.2 m

Minimum distance between sources of sound and reflecting surface for an ECHO is ( Taking velocity of sound in air to be 330 m/s )

The minimum distance between the man and the reflecting surface so that he can hear the echo is

velocity of sound in the atmosphere of a planet is 500ms^-(1). The minimum distance between the sources of sound and the obstacle to hear the echo, should be

What minimum distance is required between the source of sound and the reflecting surface to hear an echo ? Give reason.

Why will an echo not be heard when the distance between the source of sound and the reflecting surface is 10 m ?

the minimum distance between the reflecting surface and source for listening the eco of sound is ( take speed of sound 340 m/s )