The energy band gap of $Si$ is ........ $eV$.

Which of the following statements is true?

Name the primary constitutional unit of semiconductor composition.

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?

The energy gap of silicon is $1.14 \ eV$. The maximum wavelength at which silicon will begin absorbing energy is.....$\mathring A$

Although carbon,silicon,and germanium have the same lattice structure and four valence electrons each,their band structure leads to the energy gaps as: