Question

13. As the temperature is raised , the resistivity of a semiconductor a) increases b) decreases c) remains unchanged d) at first increases then decreases.​

Answer 1

Answer:

The correct answer will be option b) decreases

Answer 2

(b).For semiconductor the temperature coefficient of resistance is negative. Hence, resistivity will "decrease" with the temperature rise.

Explanation:

• The conductivity increases means the resistivity decreases. Thus when the temperature is increased in a semiconductor, the density of the charge carriers also increases and the resistivity decreases.
• Resistivity of conductors increases with increase in temperature because rate of collisions between free electrons and ions decrease with decrease of temperature.
• However, the resistivity of semiconductors decreases with increase in temperature, because more and more covalent bonds are broken at higher temperatures.