Question

A person is standing in front of a wall and makes a sound. What should be the normal minimum distance between the person and the wall , so that the person hears echo?
A. 6 meters
B. 13 meters
C. 20 meters
D. 17 meters

Answer 1

i think it's 17 metres

hope it helps

Answer 2

hey mate,

here is your answer.

Option D : 17 meters.

hope this helps you.

mark as brainliest.

:)