Temperature dependence of resistivity \(\rho(T)\) of semiconductors, insulators, and metals is significantly based on the following factors:
| (a) | number of charge carriers can change with temperature \(T\). |
| (b) | the time interval between two successive collisions can depend on \(T\). |
| (c) | length of material can be a function of \(T\). |
| (d) | 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) |
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