A p-n photodiode is made of a material with a band gap of 2.0 eV. The minimum frequency of the radiation that can be absorbed by the material is nearly :

Question

( A ) $20 \times10^{14}$ Hz
( B ) $10\times10^{14}$ Hz
( C ) $1\times 10^{14}$ Hz
( D ) $5\times10^{14}$Hz