Question 8 • Applications and Modeling
Middle C has a frequency of 261.6 Hz, and D has a frequency of 293.7 Hz. Their ratio is 293.7 ÷ 261.6 ≈ 1.123, which is approximately 9 ÷ 8 = 1.125. So the ratio of D to middle C is 9 to 8, choice B.
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