Find the momentum of a `12.0 MeV` photon.

Explanation

To find the momentum of a 12.0 MeV photon, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the relationship between energy and momentum of a photon**:
The energy (E) of a photon can be expressed in terms of its momentum (p) using the formula:
\[
p = \frac{E}{c}
...