If an electron and a photon have the same wavelength, then they will have the same
linear momentum
The de Broglie wavelength is given by λ = h/p, where λ is the wavelength, h is Planck's constant, and p is the momentum. Since both the electron and the photon have the same wavelength, and h is a constant, their momenta (p) must also be equal. Momentum is a measure of mass in motion; while they have different masses, their equal wavelengths mean they have equal linear momentum. This is true even though their velocities and energies differ significantly.
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