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The photon is a massless particle with proper momentum P = E/c + p, where the energy is given by Planck’s Law:
E = ħω = hf .
Exercise: Show that P = ħ(ω/c + k), where ω2 = c2k2 and p = ħk.
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Previous section: The Proper Momentum.
Next section: Energy-Momentum Conservation.