You See a Galaxy in Which the H $\alpha$ Line (Rest Wavelength = 656

question 94

Multiple Choice

You see a galaxy in which the H $\alpha$ 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 that 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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