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How does QED deal with wavelength of quanta [duplicate]
Since QED treats photons as individual units (quanta) how does it treat the concept of the "wavelength" associated with the photon?
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What's the wavelength of an electron after hitting a potential barrier?
I have this question:
An electron with Energy $E = 40 eV$ hits a potential barrier with $E_0 = 30 eV$. What is the wavelength of the electron after hitting the potential barrier?
I worked from ...
