At $0 \ K$,a piece of germanium:

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

Carbon, silicon, and germanium atoms have four valence electrons each. Their valence and conduction bands are separated by energy band gaps represented by $(E_g)_C$, $(E_g)_{Si}$, and $(E_g)_{Ge}$ respectively. Which one of the following relationships is true in their case?

The electrical conductivities of $Ge$ and $Na$ are $\sigma_1$ and $\sigma_2$ respectively. If these materials are heated,then:

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

If $V_0$ is the volume of a standard unit cell of germanium crystal containing $N_0$ atoms, then the expression for the mass $m$ of a volume $V$ in terms of $V_0, N_0, M$ and $N_A$ is [here, $M$ is the molar mass of germanium and $N_A$ is the Avogadro's constant].