JEE Main 2020 Physics question

If a semiconductor photodiode can detect a photon with a maximum wavelength of 400 nm, then its band gap energy is : Planck's constant h = J.s. Speed of light c = m/s

• (A)3.1 eVCorrect
• (B)1.1 eV
• (C)2.0 eV
• (D)1.5 eV