Difference between absorption and emission spectra

White light produces a continuous spectrum when passes through a prism.
 If a cold gas tube placed in front of the source of the photons the gas atoms absorb energy to move electrons to an excited state and the produced is the absorption spectrum.
 When the gas cools down electrons return to ground state and atom emits or release the emission spectrum or energy they gained before.
 Each element has its specific fingerprint line-spectrum.

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