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Atomic Energy Levels

Kinetic energ...

Question

Kinetic energy of electron in first Bohr orbit is

A

489.6 eV

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B

4.896 eV

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C

0.489 eV

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D

48.96 eV

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Solution

The correct option is A 489.6 eV
Total energy in the first Bohr orbit is
$E_{1} = 13.6 \times Z^{2} e V$
$= - 13.6 \times 36 e V = - 489.6 e V$
$∴$ K.E. of electron in the first Bohr orbit = – Total energy
= +489.6 eV

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