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Chapter 20: Problem 98

By increasing the temperature, the specific resistance of a conductor and a semiconductor: (A) Increases for both (B) Decreases for both (C) Increases, decreases (D) Decreases, increases

Short Answer

Expert verified
The specific resistance of a conductor increases with an increase in temperature, while the specific resistance of a semiconductor decreases with an increase in temperature. Therefore, the correct answer is (C) Increases, decreases.

Step by step solution

01

Concept of specific resistance

Specific resistance, also known as electrical resistivity, is the property of a material that measures its ability to resist the flow of electric current. It depends on the material's composition and temperature. For conductors and semiconductors, the behavior of specific resistance with the change in temperature is different.
02

Conductors and temperature

In conductors (e.g., metals), the resistance increases with an increase in temperature. This is because, at higher temperatures, the atoms inside the material vibrate more, making it harder for electrons to move through and increasing the resistance. Therefore, the specific resistance of a conductor increases with an increase in temperature.
03

Semiconductors and temperature

In semiconductors (e.g., silicon and germanium), the resistance decreases with an increase in temperature. This is because, as the temperature increases, more charge carriers (electrons and holes) are thermally generated, resulting in better conductivity and a decrease in resistance. Therefore, the specific resistance of a semiconductor decreases with an increase in temperature.
04

Answer

Based on the behaviors of specific resistance with temperature for conductors and semiconductors, the correct answer is: (C) Increases, decreases

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