The wavelength of light visible to the human eye is on the order of 5 × 10?7 m. If the speed of light in air is 3 × 108 m/s, find the frequency of the lightwave.
A. 3 × 107 Hz
B. 4 × 109 Hz
C. 5 × 1011 Hz
D. 6 × 1014 Hz
E. 4 × 1015 Hz
Answer: D
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