Light from an Astronomical Source Is Found to Be Shifted

Light from an astronomical source is found to be shifted to a frequency one percent lower than had the source been at rest. What relative velocity could cause such a shift?

A) 3.0 × 10⁷ m/s moving away from the observer
B) 3.0 × 10⁶ m/s moving away from the observer
C) 3.0 × 10⁶ m/s moving toward the observer
D) 1.5 × 10⁶ m/s moving toward the observer
E) 1.5 × 10⁶ m/s moving away from the observer

Correct Answer:

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