If a semiconductor photodiode can detect a photon with a maximum wavelength of 400\; nm, then its band gap energy (in eV) is : Planck's constant  h=6.63\times 10^{-34}J.s. Speed of light c=3\times 10^{8}\; m/s
Option: 1 3.1
Option: 2 2.0
Option: 3 1.5
Option: 4 1.1

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