Show that the wavelength of electromagnetic radiation is equal to the de-Broglie wavelength of its quantum (photon).

Explanation

To show that the wavelength of electromagnetic radiation is equal to the de Broglie wavelength of its quantum (photon), we can follow these steps:

### Step 1: Understand the Momentum of Electromagnetic Radiation
The momentum \( P \) of an electromagnetic wave can be expressed in terms of its frequency \( \mu \) (or \( f \)):
\[ P = \frac{H \mu}{C} \]
where \( H \) is Planck's constant and \( C \) is the speed of light.
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