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JAMB Physics 2013 Paper

Question : 39

Total: 43

Solution:

Concept:

The energy of an electron in an energy level is given by

E_n = \dfrac{E_1}{n^2}

, where

E_1

is the ground state energy and

n

is the energy level number.

Explanation:

The ground state energy is

E_1 = -24.8\ \mathrm{eV}

For the third energy level,

n = 3

Substitute into the formula:

E_3 = \frac{E_1}{3^2}

E_3 = \frac{-24.8\ \mathrm{eV}}{9}

E_3 = -2.75\ \mathrm{eV}

Answer:

The correct option is C:

-2.75\ \mathrm{eV}

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