Derive `mvr=(nh)/(2pi)` using de-Broglie equation.

Explanation

To derive the equation \( mvr = \frac{nh}{2\pi} \) using the de-Broglie equation, we will follow these steps:

### Step 1: Understand the de-Broglie Wavelength
The de-Broglie hypothesis states that every moving particle has an associated wavelength given by the formula:
\[ \lambda = \frac{h}{p} \]
where \( \lambda \) is the wavelength, \( h \) is Planck's constant, and \( p \) is the momentum of the particle.
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