4 2 pts the doppler effect considering the expansion of the universe w
4. (2 pts) The Doppler effect. Considering the expansion of the universe, when we observe stars in
distant galaxies, are the lights from most of them redshifted or blueshifted? Why?
5. (10 pts) Atom energy levels and emission/absorption lines. The diagram below shows the energy
levels of a hydrogen atom.
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