Suppose the Laboratory Wavelength of a Spectral Line Is 600

question 89

Multiple Choice

Suppose the laboratory wavelength of a spectral line is 600 nm. In a star it is measured to be 599.4 nm. Is the star moving toward or away from us, relative to the line of sight How fast is it moving (Hint: c = 300,000 km/s)

• A)toward; 300 km/s
• B)away; 300 km/s
• C)at rest; 0 km/s
• D)sideways; 300 km/s
• E)toward; 150 km/s

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