A proton and a deuteron are accelerated through the same accelerating potential. Which one of the two has less momentum? Give reasons to justify your answer.

Explanation

To determine which particle, a proton or a deuteron, has less momentum when both are accelerated through the same potential difference, we can follow these steps:

### Step 1: Understand the Mass and Charge of the Particles
- **Proton**:
- Mass (m_p) = m (mass of proton)
- Charge (q_p) = +e (elementary charge)

- **Deuteron**:
...