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..........$\mathring{A}$.

The band diagrams for three different semiconductors are shown in the figure below. Starting from the left to the right,identify the types of semiconductors they represent.

Why is the motion of an electron in a solid different from that in an isolated atom?

The forbidden energy band gaps in conductors,semiconductors,and insulators are $E_{G1}$,$E_{G2}$,and $E_{G3}$ respectively. The relation among them is:

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].

At absolute zero temperature,pure silicon behaves as