Energy Bands in Solids

Arrange the following in order of increasing band gap

Glass is a

In a semiconductor, the forbidden energy gap between the valence band and the conduction band is of the order is;

In an insulator, the energy gap between conduction band and valence band is about;

In a metal, the separation between conduction band and valence band is of the order;

Valence band is-

If the lattice constant of this semiconductor is decreased, then which of the following is correct?

Carbon, Silicon and Germanium atoms have four valence electrons each. Their valence and conduction bonds are separated by energy band gaps represented by ${\left(E_{\mathrm{g}}\right)}_{\mathrm{c}}, {\left(E_{\mathrm{g}}\right)}_{\mathrm{st}}$ and ${\left(E_{\mathrm{g}}\right)}_{\mathrm{Ge}}$, respectively. Which one of the following relationships is true on their case?

Value of forbidden energy gap for semiconductor is:

Which of the following is the best conductor of electricity?

The energy band gap of gallium arsenide phosphate is $1.98 e\mathrm{V}$. Calculate the wavelength of electromagnetic radiation emitted (in Angstrom), when electrons and holes combine in this alloy semiconductor directly. (Take Planck's constant $\left(h\right)=6.62\times {10}^{-34 }\mathrm{J} \mathrm{s}$)

The forbidden gap in the energy bands of germanium at room temperature is about 

If the energy of a photon of sodium light $(\mathrm{\lambda }=589 \mathrm{n}\mathrm{m})$ is equal to the bandgap of a semiconductor, calculate the minimum energy required to create hole-electron pair. Take, $h=6.6\times {10}^{-34} \mathrm{J} \mathrm{s}, c=3\times {10}^8 \mathrm{m} {\mathrm{s}}^{-1}$.

The forbidden energy gap between the conduction band and the valence band is not present in

The mobility of conduction electrons is greater than that of holes, since electrons

Carbon, silicon and germanium have four valence electrons each. At room temperature which one of the following statements is most appropriate?

The forbidden energy band gap in conductors semiconductor and insulators are $E_{g_1}, E_{g_2}$ and $E_{g_3}$ respectively. The relations among them is

A $p$-$n$ photodiode is made of a material with a band gap of $0.2 \mathrm{eV}$. The minimum frequency of the radiation that can be absorbed by the material is nearly:

The probability of electrons to be found in the conduction band of an intrinsic semi-conductor at a finite temperature

In a conductor, the energy gap between conduction bands and valence bands is