An electron of mass m and a photon have the same energy E. Ratio of de Broglie wavelength of the electron to that of the photon is:
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An electron of mass m and a photon have the same energy E. Ratio of de Broglie wavelength of the electron to that of the photon is:

G1 Physics · Accepted Answer

For an electron λₑ = h/√(2mE), and for a photon λγ = hc/E. Their ratio λₑ/λγ = E/[c√(2mE)] = (1/c)√(E/(2m)). Answer: D.