20. What would the speed of an observer be if a red (4.688 x 1014 Hz) traffic light appeared green (5.555 × 1014 Hz) to the observer? A) 4.445 x 108 m/s B) 2.219 x 108 m/s C) 8.438 x 107 m/s D) 5.548 x 10' m/s E) 2.890 × 106 m/s
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