| Assertion: Band gap in germanium is small. |
| Reason: The energy spread of each germanium atomic energy level is infinitesimally small. |
A) Assertion and reason both are correct statements and reason is correct explanation for assertion.
B) Assertion and reason both are correct statements but reason is not correct explanation for assertion.
C) Assertion is correct statement but reason is wrong statement.
D) Assertion is wrong statement but reason is correct statement.
Correct Answer: B
Solution :
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.
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