The difference in the variation of resistance | vedclass

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(C) In metals,the number of free charge carriers (electrons) is essentially constant with temperature. As temperature increases,the scattering of elec

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Variation of the number of charge carriers with temperature

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(C) In metals,the number of free charge carriers (electrons) is essentially constant with temperature. As temperature increases,the scattering of electrons by lattice vibrations increases,leading to an increase in resistance.In semiconductors,the number of charge carriers (electrons and holes) increases exponentially with temperature due to the thermal excitation of electrons from the valence band to the conduction band. This increase in the number of charge carriers dominates over the scattering effect,causing the resistance to decrease as temperature increases.Therefore,the fundamental difference arises due to the variation of the number of charge carriers with temperature.

The difference in the variation of resistance with temperature in a metal and a semiconductor arises essentially due to the difference in the

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