4. The line spectrum for element X includes a band of green light of wavelength 522 nm. This band corresponds to what energy transition within an atom
of element X? Let Planck's constant h = 4.136 x 10-15 ev .s, and the speed of light c = 3.00 x 108 m/s.
A a decrease of 3.23 eV
B an increase of 1.84 eV
C a decrease of 2.03 eV
D a decrease of 2.38 eV
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