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BITSAT Physics Semiconductors 2023 BITSAT 2023 (Memory Based Paper 1)

BITSAT Physics Question (2023) — Solution

Question

The effect of increase in temperature on the number of electrons in conduction band ( n _ e ) and resistance of a semiconductor will be as:

Options

  1. A. Both n _ e and resistance decrease
  2. B. Both n _ e and resistance increase
  3. C. n _ e increases, resistance decreases
  4. D. n_e decreases, resistance increases

Answer

C. n _ e increases, resistance decreases

Step-by-step solution

When temperature increases, more electrons excite to conduction band and hence conductivity increases, therefore resistance decreases.

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