From Laboratory Measurements, We Know That a Particular Spectral Line

question 22

Multiple Choice

From laboratory measurements, we know that a particular spectral line formed by hydrogen appears at a wavelength of 121.6 nanometers (nm) . The spectrum of a particular star shows the same hydrogen line appearing at a wavelength of 121.8 nm. What can we conclude?

• A)The star is getting hotter.
• B)The star is moving toward us.
• C)The "star" actually is a planet.
• D)The star is moving away from us.
• E)The star is getting colder.

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