The resistivity of a semiconductor depends upon

The state of the energy gained by valence electrons when the temperature is raised or when an electric field is applied is called as:

What is the band gap energy for Germanium $(Ge)$?

In which material is the energy band gap maximum?

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?

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