How much energy is required to cause an electron of hydrogen to move from n = 1 state to n = 2 state?

Explanation

To find the energy required to move an electron in a hydrogen atom from the n = 1 state to the n = 2 state, we can follow these steps:

### Step 1: Understand the Energy Levels
According to Bohr's model of the hydrogen atom, the energy of an electron in a particular energy level (n) is given by the formula:
\[ E_n = -\frac{13.6 \, \text{eV}}{n^2} \]
where \(E_n\) is the energy at level n, and 13.6 eV is the ionization energy of hydrogen.
...