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How light of a lower frequency could be emitted ? Give an example , specyfing the wavelength .

O ev
-0.38 ev
-0.54 eV
-0.85 ev
-1.51 ev
-3.39 ev
Energy (ev)
-13.6 ev
ionisation
ground level
С ССС
8 pint
5
=4
n=3
n=2
quantum numbers
n=1
mode

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