What is the Energy Band Gap of Silicon and Germanium respectively in eV (1) 1.1, 0.7 (2) 0.7,1.1 (3) -o.7,-1.1 (4) -1.1, -0.7

Answer: (1) 1.1eV, 0.7 eV 

The energy band gap of silicon and germanium are 1.1eV and 0.7 eV.

The distance between the valence band of electrons and the conduction band is known as a band gap. The band gap is the minimum energy required to excite an electron to a condition in the conduction band where it may conduct.

The valence band is the lower energy level, and if there is a gap between this level and the higher energy conduction band, energy must be added to allow electrons to become free. The size and presence of this band gap makes it easy to distinguish between conductors, semiconductors, and insulators.