The resistivity of a semiconductor depends on $........$.

The forbidden energy gap for a germanium crystal is approximately ....... $J$.

Choose the correct statement. In semiconductors,the valence band and conduction band

In a semiconducting material,the mobilities of electrons and holes are $\mu_e$ and $\mu_h$ respectively. Which of the following is true?

When a semiconductor is heated,its resistance

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 $c = 3 \times 10^8 \ m/s$).