Standing Waves on a String: One of the harmonics of a string fixed at both ends has a frequency of 52.2 Hz and the next higher harmonic has a frequency of 60.9 Hz. What is the fundamental frequency of the string?
A. 26.1 Hz
B. 8.7 Hz
C. 4.35 Hz
D. 30.4 Hz
E. 17.4 Hz
Answer: B
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