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October 9th, 2019, 05:18 AM   #1
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Exclamation Atomic spectra

I have a problem with emission and absorbtion spectra Iknow that when we give energy to a electron it goes to a higher level of energy but it is unstable so it just falls down to it's own orbit emitting a certain photon and causing emission spectra but why in absorbtion spectra as the sun light heats the gas giving its electron energy the gas only absorb wavelength and it doesnt emit back the photons?
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October 9th, 2019, 06:22 AM   #2
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I'm not sure if thermal radiation is absorbed just by electrons or also by atomic nuclei. One way or another, however, the energy is transmitted to kinetic energy of the atoms or potential energy of the atoms (as work, say to energize an electron or separate two bonded atoms). If the atom is not in thermal equilibrium with its surroundings, it will lose the energy again, either to a neighbouring atom (conduction/convection) or as a photon (radiation). All matter is constantly absorbing and emitting thermal energy; it's just that a system at a higher temperature will statistically lose more energy to one at a lower temperature than it gets back.
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