Q 1 :    

Conductivity of a photodiode starts changing only if the wavelength of incident light is less than 660 nm. The band gap of photodiode is found to be $\left(\frac{x}{8}\right)eV$. The value of X is (Given, $h=6.6\times {10}^{-34}Js,e=1.6\times {10}^{-19}C$)               [2024]

• 15

   

• 11

   

• 13

   

• 21