Doppler Shifted Hydrogen Absorption Lines Are Seen in the Spectrum

question 91

Multiple Choice

Doppler shifted hydrogen absorption lines are seen in the spectrum of a star. The hydrogen line at 656.28 nm is seen to be shifted to 656.08 nm. The star is moving at which fraction of the speed of light?

• A)about 0.03 (3 × 10-2)
• B)about 0.2
• C)about 0.000003 (3 × 10-6)
• D)about 0.0003 (3 ×10-4)

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