From Laboratory Measurements,we Know That a Particular Spectral Line Formed

question 115

Multiple Choice

From laboratory measurements,we know that a particular spectral line formed by hydrogen appears at a wavelength of 486.1 nanometers (nm) .The spectrum of a particular star shows the same hydrogen line appearing at a wavelength of 485.9 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.
• E)The "star" actually is a planet.

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