Draw energy level diagram for hydrogen atom, showing first four energy levels corresponding to n = 1,2, 3 and 4. Show transitions responsible for :
Emission spectrum of Balmer series.

Explanation

To solve the question, we will draw the energy level diagram for a hydrogen atom and indicate the first four energy levels corresponding to n = 1, 2, 3, and 4. We will also show the transitions responsible for the emission spectrum of the Balmer series.

### Step-by-Step Solution:

1. **Draw the Energy Levels:**
- Start by drawing a vertical line to represent the energy levels of the hydrogen atom.
- Label the energy levels as follows:
- The lowest level (n = 1) at the bottom.
...