Beats: A music tuner uses a 554-Hz C# tuning fork to tune the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency of the instrument?
A. It must be 556 Hz.
B. It must be 552 Hz.
C. It could be either 556 Hz or 552 Hz.
D. It could be either 553 Hz or 555 Hz.
E. It is neither 556 Hz or 552 Hz.
Answer: C
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