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MCAT Question A Day - 9/17/13 - Answer!

Two pulses, exactly out of phase, travel toward each other along a string as indicated below:

The phenomenon that occurs when the pulses meet is called

A.  refraction.
B.  reflection.
C.  diffraction.
D.  interference.

The correct answer is (D). By definition, two waves propagated through the same medium can be superposed to produce interference patterns.