State the postulates of Bohr's theory of hydrogen atom. Write the necessary equations.

Explanation

### Step-by-Step Solution

**Step 1: State the Postulates of Bohr's Theory of the Hydrogen Atom**

1. **Postulate 1**: Electrons can revolve only in certain stable orbits of fixed energy. These orbits are quantized, meaning that only specific energy levels are allowed.

2. **Postulate 2**: Each orbit corresponds to a specific energy level. The energy of the electron in a particular orbit is determined by the orbit itself.

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