Calculate the energy required to excite an electron from ground state to `3^(rd)` excited state if the energy of electron in `n^(th)` orbit is `-13.6//n^2`

Explanation

To calculate the energy required to excite an electron from the ground state to the third excited state, we can follow these steps:

### Step 1: Determine the energy of the ground state
The energy of an electron in the nth orbit is given by the formula:
\[ E_n = -\frac{13.6}{n^2} \text{ eV} \]

For the ground state, \( n = 1 \):
\[ E_1 = -\frac{13.6}{1^2} = -13.6 \text{ eV} \]
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