It Is Possible to Detect Doppler Shifts in the Light

question 43

Multiple Choice

It is possible to detect Doppler shifts in the light emitted from each side of a rapidly spinning star. Suppose the light from a nearby star of radius 2.5 × 10⁸ km is blue-shifted on one side of the star and red-shifted on the other side. Assume the center of mass of the star is stationary relative to Earth. If the star emits light of wavelength 525 nm that is shifted, in the received light, to 523 nm on one side of the star and to 527 nm on the other side, what is the rotational period of the star?

• A) 34 days
• B) 32 days
• C) 24 days
• D) 16 days

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