7) The molecular-orbital model for Ge shows it to be A) a conductor, because all

Question

7) The molecular-orbital model for Ge shows it to be A) a conductor, because all the lower energy band orbitals are filled and the gap between the lower and higher bands is large. B) an insulator, because all the lower energy band orbitals are filled and the p between the lower and higher bands is large. C) a semiconductor, because the gap between the filled lower and empty higher energy bands is relatively smal! D) a semiconductor, because the gap between the filled lower and empty higher energy bands is large.

Explanation / Answer

Ans : C) a semiconductor , because the gap between the filled lower band empty higher energy bands is relatively small.

The conductivity of semiconductor such as Germanium lies between that of conductors and insulators. On increasing the temperature , their conductivity increases , as the resistance decreases.

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