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The different energy levels of an atom are given by the equation:
En = -13.6 Z2/n2 eV
Z is the atomic number. For hydrogen, Z = 1.
n = 1,2,3… and so on such that the ground state has n = 1 and the second energy level (first excited state) has n = 2.
So, for first excited state, n = 2
E = -13.6/22 = -13.6/4 = - 3.4 eV
E = -5.45 * 10^-19 joules
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