A musical instrument can be tuned by comparing its frequency to that of a standard such as a tuning fork. Let's say that you hear a beat frequency of 6 Hz when comparing your instrument to a 900-Hz tuning fork. What is the frequency of your instrument?
A) 894 Hz
B) 900 Hz
C) 906 Hz
D) Either 906 Hz or894 Hz but we can't tell which
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