Weegy: The spreading of sound waves around openings in barriers is called Diffraction.
User: In which one of the following locations can a person hear the echo of a sound?
A. At least 33.2 meters behind the reflecting surface
B. Less than 16.6 meters in front of the reflecting surface
C. Less than 33.2 meters behind the reflecting surface
D. At least 16.6 meters in front of the reflecting surface
Weegy: A person can hear the echo of a sound: At least 16.6 meters in front of the reflecting surface.
User: Which one of the following environments will sound not travel through?
A. Liquid
B. Solid
C. Gas
D. Vacuum
(More) 
