1. Physics
2. Astrophysics and Atmospheric Physics
3. Galaxies
4. 244306

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The problem below is similar to the problems in chapters 25 & 26 in the Cutnell and Johnson College Physics book so it should be solved in a similar fashion. This is physics-II without calculus:

An astronomer is making an observation of a new discovered galactic object. Part of this observation is the analyisis of the light emitted by the object. It is observed that this light includes a clear pattern of the emission spectrum of atomic hydrogen. Part of that spectrum is the H-sub:alpha line, which on earth has a wavelength of 656.258nm (10^-9m). The light from this object has this spectral line at 659.0nm. Explain this discrepancy, quantitatively, using the Doppler effect.