Question

You are exploring in a cave and call out to one of your friends. You hear your echo. Which interaction of sound, (reflection, refraction or absorption), caused the echo and how did the sound waves move? (

Answer 1

irregular reflection..

Answer 2

thanks

Answer 3

sound waves move in straight line until they strike with the walls. After striking an irregular surface these waves are scattered in different directions. That causes echo because some of the waves return back after multiple irregular reflections...