| Quantity | Formula |
| Photoelectric effect | hf=Φ+Ek |
| Black body radiation | Bv(v,T)=2hv3c21ehvkT−1 |
| Energy of photon | E=hf |
| Mass-energy | E=mc2 |


| Quantity | Formula |
| Photoelectric effect | hf=Φ+Ek |
| Black body radiation | Bv(v,T)=2hv3c21ehvkT−1 |
| Energy of photon | E=hf |
| Mass-energy | E=mc2 |
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