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Sound waves from a loud bass guitar are represented below approaching a soundproof barrier as viewed from above. The barrier has an opening as shown, which is narrower than the wavelength of the sound waves. Five locations are shown on the side of the barrier opposite the bass guitar.

A person at which location(s) would likely hear the sound and why?

A

3 only; sound waves are completely chopped off

B

2, 3, and 4 only; refraction

C

all locations; refraction

D

all locations; diffraction

E

all locations; Doppler effect

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