In a good conductor,the energy gap between the conduction band and the valence band is:

The forbidden energy gap in $Ge$ is $0.72\,eV$. Given,$hc = 12400\,eV\cdot\mathring{A}$. The maximum wavelength of radiation that will generate an electron-hole pair is..........$\mathring{A}$.

If the temperature of a semiconductor is increased,which of the following statements is correct?

Regarding a semiconductor,which one of the following is wrong?

The energy gaps $(E_g)$ between the valence band and conduction band for diamond, silicon, and germanium are in the order:

On the basis of which principle are the band diagrams of solids classified into different types?