Question

The spreading of sound waves around openings in barriers is called? A. refraction B. an echo C. diffraction D. reverberation

Answer 1

I think C. namely diffraction

Answer 2

Take a look at this discussion of behavior of waves:

http://www.physicsclassroom.com/class/waves/Lesson-3/Reflection,-Refraction,-and-Diffraction

@jmshort78

Answer 3

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Answer 4

@jmshort78