The total energy of electron in the ground state of hydrogen

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The total energy of electron in the ground state of hydrogen atom is – 13.6 eV. The kinetic energy of an electron in the first excited state is

1. 6.8 eV
2. 13.6 eV
3. 1.7 eV
4. 3.4 eV

Correct Option: D

Energy in the first excited state

=	- 13.6
	n²

=	- 13.6	= - 3.4eV
	2²

But K.E. = –(Total energy) = +3.4 eV.