You See a Galaxy in Which the Hα Line (Rest

question 79

Multiple Choice

You see a galaxy in which the Hα line (rest wavelength = 656.3 nm) is observed at a wavelength of 756.3 nm.What would be the observed wavelength of a particular helium line,which has a rest wavelength of 1,083 nm?

• A)1,083 nm
• B)1,183 nm
• C)1,248 nm
• D)1,440 nm
• E)3,142 nm

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