If the wavelength of an electromagentic radiation is doubled, what will happen to (i) the energy of photons and (ii) the momentum of photon?

Explanation

To solve the problem, we need to analyze how the energy and momentum of photons change when the wavelength of electromagnetic radiation is doubled.

### Step-by-Step Solution:

1. **Understanding Energy of a Photon**:
The energy \( E \) of a photon is given by the formula:
\[
E = \frac{hc}{\lambda}
...