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Modern Physics

Dual Nature of Radiation and Matter
Atoms
Nuclei
Semiconductor Electronics : Materials, Devices and Simple Circuits
  1. The total energy of an electron in the first excited state of hydrogen atom is about –3.4 eV. Its kinetic energy in this state is ​​
    1. 3.4 eV ​
    2. 6.8 eV ​
    3. –3.4 eV
    4. –6.8 eV
Correct Option: A

K.E =
Z2
(13.6 eV)
n2

Mechanical energy =
- Z2
(13.6 eV)
n2

∴ K.E. in 2nd orbital for hydrogen ​= – Mechanical energy
=
12
(13.6) = + 3.4 eV
22


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