Question

Sam is standing in an empty auditorium. He yells and hears his voice echo. What is happening to the sound to cause this echo?
A.
transmission of the sound waves within his ears
B.
reflection of sound waves off the walls
C.
distribution of the sound waves through the auditorium
D.
absorption of the sound waves by his voice

Answer 1

B. reflection of sound waves off the walls

An echo is produced when sound waves bounce off hard surfaces (walls, ceiling) and return to the listener after a delay.