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Question

A single electron is revolving orbits a round nucleus a stationary (z = 5). The energy required to excite the electron from the third to the fourth Bohr orbit will be:

A
4.5 eV
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B
8.53 eV
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C
25 eV
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D
16.53 eV
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Solution

The correct option is C 16.53 eV
ΔE=E4E3

=13.6×Z216+13.6×Z29

= 13.6×25[19+116]=16.5 eV

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