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BITSAT 2018
Exam
BITSAT
Year
2018
Subject
Physics
Chapter
Semiconductors

BITSAT 2018 · Physics · Semiconductors

At a certain temperature, the number density of charge carriers in...

At a certain temperature, the number density of charge carriers in a semiconductor is nn. When an electric field is applied to it, the charge carriers drift with an average speed vv. If the temperature of the semiconductor is raised.

Options

  1. Ann will increase but vv will decrease
  2. Bnn will decrease but vv will increase
  3. CBoth nn and vv will increase
  4. DBoth nn and vv will decrease

Correct answer

A. nn will increase but vv will decrease

Step-by-step solution

On raising the temperature of the semiconductor, covalent bonds start breaking up and thus& more charge carriers release. This will increase the value of nn and as a result the rate of collision of charge carriers will increase. This will decrease the drift speed vv.
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