JEE Main 2003 Physics question

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

(1)crystal structure
(2)variation of the number of charge carriers with temperatureCorrect
(3)type of bonding
(4)variation of scattering mechanism with temperature

Answer: (2)

Solution

In a metal the number of free electrons is essentially constant, and resistance rises with temperature because of increased scattering. In a semiconductor the number of charge carriers increases rapidly (exponentially) with temperature, which outweighs the

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Question ID VK-038136