Multiple choice

The resistivity of an intrinsic semiconductor decreases with increasing temperature. This is because with increasing temperature,

  1. Both the carrier concentration and mobility of carriers decrease

  2. The carrier concentration increases but the mobility of carriers decreases

  3. The carrier concentration decreases but the mobility of carriers increases

  4. The carrier concentration remains the same but the mobility of carriers decreases

  5. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Conductivity is inversely proportional to resistivity. As we increase the temperature in intrinsic semiconductor, both electrons and holes start vibrating and colliding with each other generating more and more electrons and holes. Due to collision between the atoms, mobility decreases.

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