Question: An electron beam and a photon beam pass through identical slits. On a distant screen, the first dark fringe occurs at the same angle for

An electron beam and a photon beam pass through identical slits. On a distant screen, the first dark fringe occurs at the same angle for both of the beams. The electron speeds are much slower than that of light.
(a) Express the energy of a photon in terms of the kinetic energy K of one of the electrons.
(b) Which is greater, the energy of a photon or the kinetic energy of an electron?

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