An electron of mass m and a photon have same energy E. The ratio of de-Broglie wavelengths associated with them is
λ_e=h/√(2mE), λ_ph=hc/E, ratio λ_e/λ_ph=√(E/2mc^2) etc.
Ref: NCERT Physics Class 12 Chapter 11 Dual Nature of Radiation and Matter
#equal energy
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