Correct Answer - B
p-n photodiode is a semiconductor diode that produces a significant current when illuminated, it is reversed biased but is operated below the breakdown voltage.
Energy of radiation = band gap energy
i.e. `hv =2.0 eV`
`or v=(2.0xx1.6xx10^(-19))/(6.6xx10^(-34))=5xx10^(14) Hz`
