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BITSAT2018PhysicsSemiconductorsActual

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

Options

  1. An will increase but v will decrease
  2. Bn will decrease but v will increase
  3. CBoth n and v will increase
  4. DBoth n and v will decrease

Correct answer

A. n will increase but v 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 n and as a result the rate of collision of charge carriers will increase. This will decrease the drift speed v .

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