Two violinists are trying to tune their instruments in an orchestra. One is producing the desired frequency of 440.0 Hz
The other is producing a frequency of 448.4 Hz. By what percentage should the out-of-tune musician change the tension in his string to bring his instrument into tune at 440.0 Hz?
A) +1.9%
B) -1.9%
C) +3.7%
D) -3.7%
E) +8.4%
Answer: D
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= 530 nm for green
A. 
B. 
C. 
D. 