Ncert Exercises & Solutions

Select the correct option based on statements below:

Assertion (A):	Semiconductors are solids with conductivities in the range from 10^-6 — 10⁴ohm^-1 m^-1.
Reason (R):	Intermediate conductivity in semiconductors is due to a partially filled valence band.

1.	Both (A) and (R) are true and (R) is the correct explanation of (A).
2.	Both (A) and (R) are true but (R) is not the correct explanation of (A).
3.	(A) is true but (R) is false.
4.	(A) is false but (R) is true.

Hint: Semiconductors are materials that have a conductivity between conductors (generally metals) and nonconductors or insulators.

Semiconductors are solids with conductivities in the intermediate range varying from 10^-6 — 10⁴ohm^-1 m^-1. Intermediate

conductivity is due to the small energy gap between the valence band and conduction band. Therefore, some electrons may
jump to the conduction band and show some conductivity.

The electrical conductivity of semiconductors increases with rising in temperature since more electrons can jump to the conduction band.

Hence, Assertion is a correct statement but Reason is an incorrect statement.

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