(a) region A (b) region B A distant galaxy is simultaneously rotating and recedi

Question

(a) region A

(b) region B

A distant galaxy is simultaneously rotating and receding from the earth. As the drawing shows, the galactic center is receding from the earth at a relative speed of uG = 1.50 106 m/s. Relative to the center, the tangential speed is vT = 3.00 105 m/s for locations A and B, which are equidistant from the center. When the frequencies of the light coming from regions A and B are measured on earth, they are not the same and each is different than the emitted frequency of 6.00 1014 Hz. Find the measured frequency for the light from each of the following. (a) region A (b) region B

Explanation / Answer

http://www.webassign.net/CJ/24_37.gif

A: http://en.wikipedia.org/wiki/Doppler_eff...


f = fo (c + vr)/(c + vs)

where
c is the velocity of waves in the medium = speed of light
vr is the velocity of the receiver relative to the medium; positive if the receiver is moving towards the source;
vs is the velocity of the source relative to the medium; positive if the source is moving away from the receiver.

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