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KCET2021PhysicsSemiconductors

Identify the incorrect statement.

Options

  1. AWhen a p -n junction diode is forward biased, then the width of the depletion region decreases.
  2. BWhen a p - n junction diode is reverse biased, the barrier potential increases.
  3. CA photodiode is operated in the reverse bias.
  4. DAn LED is a lightly doped p - n junction diode which emits spontaneous radiation of forward biasing.

Correct answer

D. An LED is a lightly doped p - n junction diode which emits spontaneous radiation of forward biasing.

Step-by-step solution

The LED is a heavily doped p - n junction with forward biasing. It is a specially designed forward biased p - n junction diode that emits light spontaneously when energised.

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