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…

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