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Question

The energy levels of an atom of element X are shown in the diagram. Which one of the level transitions will results the emission of photons of wavelength 620 nm? Support your answer with mathematical calculations
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Solution

Transition D will result in a wavelength of 620nm
Mathematics-
Energy difference in levels = energy of emitted photon=1237.5xeV where x is wavelength in nanometer.
Given that x=620nm so Energy,E=1237.5620eV=1.995eV
Which is nearly 2eV
We notice the difference in energy level for transition D is 2 eV given as 1eV(3eV)=2eV.

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