Consider a spiral galaxy that is moving directly away from Earth with a speed V = 3.600x10^6 m/s at its center. The galaxy is also rotating about its center, so that points in its spiral arms are moving with a speed v = 7.500x10^5 m/s relative to the center. Light with a frequency of 8.870x 10^14 Hz is emitted in both arms of the galaxy, and this light is detected by astronomers on Earth.

What frequency is detected by the astronomers observing the upper arm? (Enter your answer to 4 significant figures.)
What frequency is detected by the astronomers observing the lower arm?

Question

Consider a spiral galaxy that is moving directly away from Earth with a speed V = 3.600x10^6 m/s at its center. The galaxy is also rotating about its center, so that points in its spiral arms are moving with a speed v = 7.500x10^5 m/s relative to the center. Light with a frequency of 8.870x  10^14 Hz is emitted in both arms of the galaxy, and this light is detected by astronomers on Earth.

What frequency is detected by the astronomers observing the upper arm? (Enter your answer to 4 significant figures.)
What frequency is detected by the astronomers observing the lower arm?