Light from an Astronomical Source Is Found to Be Shifted

question 13

Multiple Choice

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

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