HomeSSCA 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 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?By Admin / October 4, 2025 A. 6 meters B. 13 meters C. 20 meters D. 17 meters ✅ The correct answer is option D.