Question
Physics Question on applications of diode
Which one of the following statements is not correct in the case of light-emitting diodes?
A. It is a heavily doped p-n junction.
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 then the energy gap of the semiconductor used.
Choose the correct answer from the options given below:
A
C and D
B
C
C
B
D
A
Answer
C
Explanation
Solution
⇒ LED is a heavily doped, forward biased p-n-junction diode
⇒ It will not emit light in reverse bias
⇒ Energy of emitted photon is equal to or slightly less the band gap energy of forbidden band