Light from an astronomical source is found to be shifted to a one percent lower frequency than had the source been at rest.What radial velocity could cause such a shift? A) 3.0 $\times$ 10⁷ m/s moving away from the observer B) 3.0 $\times$ 10⁶ m/s moving away from the observer C) 3.0 $\times$ 10⁶ m/s moving toward the observer D) 1.5 $\times$ 10⁶ m/s moving toward the observer E) 1.5 $\times$ 10⁶ m/s moving away from the observer

Question

Quizplus · Accepted Answer

The Doppler effect causes a frequency shift proportional to the velocity of the source relative to the observer. A 1% decrease in frequency indicates the source is moving away. Using the formula for non-relativistic Doppler shift, v = (Δf/f) * c, where Δf/f = 0.01 and c = 3.0 * 10^8 m/s, the velocity v is approximately 3.0 * 10^6 m/s.

Light from an Astronomical Source Is Found to Be Shifted ×\times×

Light from an Astronomical Source Is Found to Be Shifted $\times$