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The total energy of eletcron in the grou...

The total energy of eletcron in the ground state of hydrogen atom is `-13.6 eV`. The kinetic enegry of an electron in the first excited state is

A

`6.8 eV`

B

`13.6eV`

C

`1.7eV`

D

`3.4eV`

Text Solution

Verified by Experts

The correct Answer is:
D
Total energy =P.E. + K.E.
`=-13.6 eV=-2KE+KE=-KE`
`:.KE=+13.6eV`
In first excited state, n=2
`:. K.E. =13.6/(2^(2))eV=3.4eV`
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