(a) Using de Broglie's hypothesis, explain with the help of a suitable diagram, Bolirs seconti pusitiaie of quantization of energy levels in a hydrogen atom.
(b) The ground state energy of hydrogen atom is -13.6 eV. What are the kinetic and poientialenegies of the electron in this state?

Explanation

### Step-by-Step Solution

#### Part (a): Explanation of Bohr's Second Postulate Using de Broglie's Hypothesis

1. **Understanding Bohr's Second Postulate**:
- Bohr's second postulate states that the angular momentum \( L \) of an electron in an orbit is quantized and can be expressed as:
\[
L = n \frac{h}{2\pi}
...