The energy required for an electron to jump the forbidden band for germanium at room temperature is $........... eV$.

Electrical conductivity of insulators is

If the energy gap of a substance is $5.4 \ eV$,then the substance is

Give an explanation of energy band,valence band,and conduction band in a crystal.

Statement-$1$: The temperature coefficient of resistance of an intrinsic semiconductor is negative.
Statement-$2$: As temperature increases,more charge carriers are released into the conduction band.

The energy of a photon of sodium light $(\lambda = 589 nm)$ is equal to the band gap of a semiconductor material. Find the value of $E/kT$ at $300 K$.