Which of the following statements is $NOT$ correct in the case of an $LED$?

  • A
    It is a heavily doped $p-n$ junction diode.
  • B
    It emits light only when it is forward biased.
  • C
    It emits light only when it is reverse biased.
  • D
    The energy of the light emitted is equal to or slightly less than the energy gap of the semiconductor used.

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Assertion: $A$ $p-n$ junction with reverse bias can be used as a photo-diode to measure light intensity.
Reason: In a reverse bias condition,the current is small but is more sensitive to changes in incident light intensity.

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What kind of diode is used as a photo detector?

Identify the mismatch out of the following.

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