Question

Which graph shows correctly the temperature (T). dependence of resistivity \((\rho)\) of a semiconductor?

• A. C
• B. A
• C. D
• D. B

Hint:

For a semiconductor, resistivity falls rapidly as temperature rises.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept
In a semiconductor more charge carriers are freed as temperature rises, so resistivity decreases, and the decrease is non-linear (exponential).

Step 2: Look at the graphs
Graphs A and B rise with T, which is the behaviour of a metal. Graph D is a straight line, which is not exponential. Graph C falls steeply and then flattens.

Step 3: Result
Graph C is correct, and option (A) is labelled C.

Final Answer:
The correct graph is a curve with resistivity falling as temperature rises. \[ \boxed{\text{(A) }\text{graph C}} \]