Using Bohr's postulates, obtain the expressions for (i) kinetic energy and (ii) potential energy of the electron in stationary state of hydrogen atom.
Draw the energy level diagram showing how the transitions between energy levels result in the appearance of Lymann Series.

Explanation

To solve the problem of obtaining the expressions for the kinetic energy and potential energy of an electron in a stationary state of a hydrogen atom using Bohr's postulates, we can follow these steps:

### Step 1: Understanding Bohr's Postulates
According to Bohr's first postulate, electrons revolve in certain stationary orbits around the nucleus without emitting electromagnetic radiation. The second postulate states that the angular momentum of the electron in these orbits is quantized and given by:
\[ L = n \frac{h}{2\pi} \]
where \( n \) is a positive integer (the principal quantum number) and \( h \) is Planck's constant.

### Step 2: Equating Centripetal Force and Electrostatic Force
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