The lowest unfilled energy band formed just above the valence band is called conduction band. (True/false)

What is conduction band ?

What is valence band ?

What is allowed energy band?

Reciprocal of resistance is called conductance.(True/False)

Fill ups If there is a large energy gap between the filled valence band and empty conduction band, the subtance acts as …………….. .

The question given below consist of an assertion (A) and a reason ( R). Use the following key to choose the appropriate answer to these questions from the codes (a), (b), ( c) and (d) given below: (a) Both A and R are true and R is the correct explanation of A. (b) Both A and R are true but R is NOT the correct explanation of A. (c) A is true but R is false. (d) A is false and R is also false. Assertion: The energy gap between the valence band and conduction band is greater in silicon than germanium. Reason: Thermal energy produces fewer minority carries in silicon than in germanium.