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September 4, 2015

Homework Help: Astronomy - help!

Posted by anonymous on Saturday, November 29, 2008 at 4:38pm.

Imagine that you have obtained spectra for several galaxies
and have measured the observed wavelength of the H emission line of atomic hydrogen. The rest wavelength of H is 656.3 nanometers
(nm). Your results are as follows:
Galaxy 1: Observed H wavelength is 664.7 nm
Galaxy 2: Observed H wavelength is 659.6 nm
Galaxy 3: Observed H wavelength is 679.2 nm
Put these three galaxies into a list sorted by distance away from the Earth, with the closest
galaxy first in the list and the farthest galaxy last in the list. Explain your reasoning.

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