Laboratory Measurements Show Hydrogen Produces a Spectral Line at a Wavelength

question 18

Multiple Choice

Laboratory measurements show hydrogen produces a spectral line at a wavelength of 486.1 nanometers (nm) . A particular star's spectrum shows the same hydrogen line at a wavelength of 486.0 nm. What can we conclude?

• A) The star is moving toward us.
• B) The star is moving away from us.
• C) The star is getting hotter.
• D) The star is getting colder.

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