A semiconductor has a direct band gap of 2.5 eV. Of the incident light wavelengths given below, the one that cannot be absorbed is (Take h = 6.626 × 10-34, q = 1.6 × 10-19C)
1
600 nm
2
490 nm
3
450 nm
4
400 nm
A semiconductor has a direct band gap of 2.5 eV. Of the incident light wavelengths given below, the one that cannot be absorbed is (Take h = 6.626 × 10-34, q = 1.6 × 10-19C)