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Question

The amount of energy emitted when an electron jumps from n=4 to n=2 in an H-atom is:

A
4.08×1019 J
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B
0.408×1019 J
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C
2.02×1019 J
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D
40.8×1019 J
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Solution

The correct option is A 4.08×1019 J
Energy emitted when an electron makes a transition from a higher energy level to a lower energy level is given by :
Eemitted=13.6 eV×(1n211n22)
Where, n2 is the higher energy level and n1 is the lower energy level.
E=13.6 eV×(14116)=2.55 eV
E=2.55×1.602×1019 J
E=4.08×1019 J.

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