Temperature dependence of resistivity (T) of semiconductors, insulators, and metals is significantly based on the following factors:
1. | number of charge carriers can change with temperature T |
2. | the time interval between two successive collisions can depend on T |
3. | length of material can be a function of T |
4. | mass of carriers is a function of T |
Which of the above statements is correct?
1. (a, b)
2. (c, d)
3. (b, c)
4. (b, d)
The resistivity of a metallic conductor is given by,
where n is the number of charge carriers per unit volume which can change with temperature T and it is the time interval between two successive collisions which decreases with the increase of temperature in metals.
Also, the no. of charge carriers in semiconductors increases with temperature.
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