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MCAT Question A Day - 1/1/14 - Answer!

If two identical sound waves interact in phase, the resulting wave will have a

A.  shorter period.
B.  larger amplitude.
C.  higher frequency.
D.  greater velocity.

The correct answer is (B). Two waves are in phase if their crests and troughs coincide. The amplitude of the resulting wave is the algebraic sum of the amplitudes of the two waves being superposed at that point. Therefore, the amplitude is doubled.