Photon is a packet of energy in form of ray. If a photon and an electron have the same momentum, they have the same wavelength.
The momentum is the amount of motion present in particle.
The momentum p and wavelength λ are related as
p = h / λ
where h is the plank constant.
Thus, If a photon and an electron have the same momentum, they have the same wavelength.
Learn more about momentum.
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