In a \( p \)-n junction the depletion region is \( 400 \mathrm{~nm} \) wide and electric field of \( 5 \times 10^{5} \mathrm{Vm}^{-1} \) exists in it. The minimum energy of a conduction electron, which can diffuse from \( n \)-side to the \( p \)-side is:
(a) \( 4 \mathrm{eV} \)
(b) \( 5 \mathrm{eV} \)
(c) \( 0.4 \mathrm{eV} \)
(d) \( 0.2 \mathrm{eV} \)
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