Photon And Matter Waves

Step 1: Chargeless particles.
Chargeless particles are particles that do not carry any electrical charge. A photon is the only particle in the list that is chargeless.
Step 2: Elimination.
- (A) α-particle: Incorrect, an alpha particle consists of two protons and two neutrons, thus it carries a positive charge.
- (B) β-particle: Incorrect, a beta particle is an electron, which carries a negative charge.
- (C) Proton: Incorrect, a proton carries a positive charge.
- (D) Photon: Correct, a photon is a particle of light and does not have any charge.
Step 3: Conclusion.
Thus, the photon is the chargeless particle.