Question

Q. Consider the following pairs:

Particle	Antiparticle
1. Proton	Electron
2. Electron	Positron
3. Neutron	Photon

Which of the pairs given above is/are correctly matched?

• A. 1 and 2 only
• B. 2 only
• C. 2 and 3 only
• D. 1, 2 and 3

Answer 1

The correct option is B 2 only

Explanation:

Only pair 2 is correctly matched: In particle physics, for most kinds of particles there are associated antiparticles. The antiparticle has the same mass and opposite charge (including electric charge). For example, for every quark, there is a corresponding type of antiparticle. The antiquarks have the same mass, mean lifetime, and spin as their respective quarks, but the electric charge and other charges have the opposite sign.

1. Proton - Antiproton
2. Electron - Positron
3. Neutron - Antineutron