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If an electron drops from 4th orbit to 2...

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

A

It gains 2.55 eV of potential energy

B

it gains 2.55 eV of total energy

C

it emits a 2.55 eV photon

D

it emits a 255 eV photon

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The correct Answer is:
C
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