A galaxys hydrogen- spectral line, normally at 486.1 nm, appears at 495.4 nm. (a) Use the Doppler

Question:

A galaxy’s hydrogen-β spectral line, normally at 486.1 nm, appears at 495.4 nm.
(a) Use the Doppler shift of Chapter 14 to find the galaxy’s recession speed,
(b) infer the distance to the galaxy. Is it appropriate to use Chapter 14’s nonrelativistic Doppler formulas in this case?

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