At absolute zero,$Si$ acts as

At absolute zero temperature,an intrinsic semiconductor behaves as

At ordinary temperatures, the electrical conductivity of semiconductors in $S/m$ (or $mho/m$) is in the range:

What is the maximum wavelength of electromagnetic radiation that can create an electron-hole pair in a material with a band gap of $0.7 \ eV$? (Planck's constant $h = 4.136 \times 10^{-15} \ eV \cdot s$, velocity of light $c = 3 \times 10^8 \ m/s$).

The explanation of the band structure in solids is due to:

In the case of a semiconductor,which of the following statements is wrong?