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Define the electric resistivity of conductor. Plota graphshowing the variation of resistivity with temperature in the case of a (a) conductor (b) semiconductor .Briefly explain, how the difference in the behaviour of the two can be explained in terms of number density of charge carriers and relaxation time. |
Answer» Solution :2nd PART:  3rd part: We know , `rho=m/( N e ^2 R)` In conductors, the average relaxation time decreases with INCREASE In temperature,resulting in an increase in resistivity. In semiconductors , the increase in number density (with increase in temperature) is more than the decrease in relaxation time .The ultimate RESULT in therefore a decrease in resistivity. |
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