When the electrical conductivity of a semiconductor is due to the breaking of its covalent bonds,then the semiconductor is said to be

Carbon,Silicon,and Germanium have four valence electrons each. These are characterized by valence and conduction bands separated by energy band gaps respectively equal to $(E_g)_C, (E_g)_{Si},$ and $(E_g)_{Ge}$. Which of the following statements is true?

When a semiconductor is heated,its resistance

When the temperature of a silicon sample is increased from $27^\circ C$ to $100^\circ C$,the conductivity of silicon will be

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 energy gap in semiconductors is of the order of ........ $eV$.