photon momentum

Question

Photon momentum p equals?

RankGuru · Accepted Answer

1. **Energy Formulas**: $E = hf$ (Quantum) and $E = pc$ (Relativistic for $m=0$).
2. **Combine**: $pc = hf$.
3. **Rearrange**: $p = \frac{hf}{c}$.
4. **Wave Relation**: Substitute $f/c = 1/\lambda$.
5. **Result**: $p = \frac{h}{\lambda}$.
6. **Significance**: Despite having zero rest mass, photons carry momentum and can exert radiation pressure.

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