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If an electron drop from `4th` orbit to `2nd` orbit in an H-atom, then

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If an electron drop from `4th` orbit to `2nd` orbit in an H-atom, then
A. it gains 2.55eV of potential energy
B. it gain 2.55eV electron
C. it emits a 2.55eV electron
D. it emits a 2.55 eV photon
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1 Answer

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Correct Answer - D
`E_(n)=-(13.6Z^(2))/n^(2)eV:DeltaE=E_(4)-E_(2)`
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