Summarizing Photon Momentum


  • Photons have momentum, given by \(p=\cfrac{h}{\lambda }\), where \(\lambda \) is the photon wavelength.
  • Photon energy and momentum are related by \(p=\cfrac{E}{c}\), where \(E=\text{hf}=\text{hc}/\lambda \) for a photon.


photon momentum

the amount of momentum a photon has, calculated by \(p=\cfrac{h}{\lambda }=\cfrac{E}{c}\)

Compton effect

the phenomenon whereby x rays scattered from materials have decreased energy

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