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The conductivity of a semiconductor incr...

The conductivity of a semiconductor increases with increase in temperature because

A

number density of free current carriers increases

B

relaxatoin time increses

C

both number density of carriers and relaxiation time increase

D

number density of current carriers increases relaxation time decreased but effect of decrease in relaxation time is much less than increase in number density

Text Solution

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With the increase in temperature relaxation time decreases and on the other hand the numbr density of current carriers increases but the effect increases in number denisty
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