You Record the Spectrum of a Star and Find That

question 18

Multiple Choice

You record the spectrum of a star and find that a calcium absorption line has an observed wavelength of 394.0 nm. This calcium absorption line has a rest wavelength is 393.3 nm; what is the radial velocity of this star?

• A) 5,000 km/s
• B) 500 km/s
• C) 50 km/s
• D) 5 km/s
• E) 0.5 km/s

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