In a p–type semiconductor the acceptor level is situated 57 meV above the valence band. The maximum wavelength of light required to produce a hole will be –
Answer & explanation
Correct answer: option 3
$λ=\frac{hc}{eE}=\frac{6.62× 10^{–34}×3×10^8×10^{10}}{1.6×10^{-19}×57×10^{-3}}Å=217100Å$