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Why are there fewer lines on the absorption spectrum than on the emission spectrum for some gases?
I don't know if this is right, but I think that it is because:
when the gas is heated, the electrons get 'excited' and move up to an energy level (lets say an electron moves up 4 energy levels).
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2
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How/why did the Thomson scattering by early plasma of the CMB create a particular polarization?
I understand how Thomson scattering polarizes EM radiation, but why/how did particles of the early universe create a particular polarization pattern of the CMB? (E-mode polarization)....
I mean, the ...
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