Assertion (A) : If an electron has the same wavelength as a photon, they have the same energy.
Reason (R) : By de Broglie hypothesis, p = h/λ for both the electron and the photon.
Answer & explanation
Correct answer: option 4
$\text{Energy of photon }E = \frac{hc}{\lambda}$
$\text{Energy of electron } E' = \frac{p^2}{2m} = \frac{h^2}{2m\lambda^2}$