The Pauli's exclusion principle is not applicable to

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Canvas Classes · Accepted Answer

Pauli's Exclusion Principle applies to fermions — particles with half-integer spin ().

Classifying each particle:

| Particle | Spin | Type |
|---|---|---|
| Electron |  | Fermion ✓ |
| Positron |  | Fermion ✓ |
| Photon |  | Boson |
| Proton |  | Fermion ✓ |

Photons are bosons (integer spin = 1). Bosons are not subject to Pauli's exclusion principle — any number of bosons can occupy the same quantum state (this is the basis of lasers and Bose-Einstein condensates).

Final Answer: Photons → Op

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