Q143 / 180 · KCET 2021 · Physics

Identify the incorrect statement.

  • A
    When a $p$-n junction diode is forward biased, then the width of the depletion region decreases.
  • B
    When a $p$ - $n$ junction diode is reverse biased, the barrier potential increases.
  • C
    A photodiode is operated in the reverse bias.
  • Correct answer
    D
    An LED is a lightly doped $p$ - $n$ junction diode which emits spontaneous radiation of forward biasing.

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.

Hence, the correct answer is option: 'D'.

Relevant Questions