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energy of an atom be quantized

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cardrap:
 What experiment requires the emission of energy by an atom be quantized?



   thanks

Mitch:
Burn some table salt, you'll notice that light only emits in the yellow frequency. Instead of at all frequencies giving a rainbow or white light effect.

Albeit this is not the best experiment.

Donaldson Tan:
I think all cases should be quantitised due to the fact that all electrons in atoms can only be promoted to and demoted to fixed energy levels within the atom.

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