From classical electromagnetism we know that the electromagnetic field carries momentum, which is related to energy density of the field and in particular can be transferred to a particle via interaction. On the other side we also know from the photoelectric effect that $E=hv\nu$ and a photon has momentum $p$

What is the relation between the two point of view?

  • $\begingroup$ For a photon the mass is zero so we get $E=cp=h\nu$. As $c=\nu \lambda$ this means that $p=h/\lambda$ for the photon momentum. Is this what you are asking? $\endgroup$
    – mike stone
    Jan 30, 2022 at 21:34


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