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The ground state energy of hydrogen atom is -13.6 eV. What is the kinetic energy of electron in this state?

Asked in GUJCET 2020; GUJCET 2021 · Energy levels and ionisation

Answer: (3) +13.6 eV

Step-by-step solution

Given: total energy E=-13.6 eV.

Idea: for a Coulomb orbit K=(ke²)/(2r) and E=-(ke²)/(2r), so K=-E.

K=-(-13.6)=+13.6 eV.

Check: U=2E=-27.2 eV, and 13.6-27.2=-13.6 eV returns E.

Why the other options are wrong

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