Band gap in germanium is small.
The energy spread of each germanium atomic energy level is infinitesimally small.

Options

A. If both assertion and reason are correct and reason is correct explanation for assertion
B. If both assertion and reason are correct but reason is not correct explanation for assertion
C. If assertion is correct but reason is incorrect
D. If both assertion and reason are incorrect

Answer

B

Explanation

Correct Explanation Germanium is a semi conductor since the energy gap between the adjacent bands is small, As a result, electrons are promoted from filled valence band to empty conduction band. This leaves both bands partially filled and germanium conducts electricity