The ground state energy of hydrogen atom is – 13.6 eV. What is the potential energy of the electron in this state

(a) 0 eV                       (b) – 27.2 eV
(c) 1 eV                       (d) 2 eV

(b) P.E. = 2×Total energy = 2×(-13.6)=-27.2 eV

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