Home Physics Semiconductor Electronics Karnataka - CET Previous Year Question The conductivity of semiconductor increases …
Physics Semiconductor Electronics Karnataka - CET Previous Year Question MCQ (Single Correct)

The conductivity of semiconductor increases with increase in temperature because

A
both number density of charge carriers and relaxation time increase
B
number density of charge carriers increases
C
number density of current carriers increases, relaxation time decreases but effect of decrease in relaxation time is much less than increase in number density
D
relaxation time increases.

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Text Solution

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The correct answer is:
C

Due to increase in temperature bonds break which liberates large number of holes and electrons (charge carriers). Relaxation time too decreases but its effect is much less.

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