Beats: Two Harmonic Sound Waves Reach an Observer Simultaneously

Multiple Choice

Beats: Two harmonic sound waves reach an observer simultaneously. The observer hears the sound intensity rise and fall with a time of 0.200 s between the maximum intensity and the succeeding minimum intensity. What is the difference in frequency of the two sound waves?

A) 10.0 Hz
B) 0.200 Hz
C) 5.00 Hz
D) 2.50 Hz
E) 1.25 Hz