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Emission and Absorption Spectra

In hydrogen a...

Question

In hydrogen atom, energy of first excited state is $- 3.4 e V$ . Then find out the $K E$ of the same orbit of hydrogen atom.

A

+ 3.4 e V

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B

+ 6.8 e V

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C

- 13.6 e V

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D

+ 13.6 e V

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Solution

The correct option is A $+ 3.4 e V$
The energy in an excited state is nothing but kinetic energy.
Thus, $K E$ of $H - a t o m = - T E = + 3.4 e V$ .

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