Question:
Which of the following statement is NOT correct in the case of 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.
Which of the following statement is NOT correct in the case of 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.
(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.
Show Hint
An LED emits light only under forward bias.
Updated On: Oct 1, 2026
- A
- B
- C
- D
Show Solution
Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Step 1: Facts
An LED is a heavily doped p-n junction. It emits light when forward biased, because electron-hole recombination releases photons. The photon energy is close to, and a little less than, the band gap.
Step 2: Check
Statements (A), (B) and (D) are correct. Statement (C) says it emits light only when reverse biased, which is wrong. Option (C).
Final Answer:
Statement C is not correct. \[ \boxed{\text{(C)}\ \text{(C)}} \]
An LED is a heavily doped p-n junction. It emits light when forward biased, because electron-hole recombination releases photons. The photon energy is close to, and a little less than, the band gap.
Step 2: Check
Statements (A), (B) and (D) are correct. Statement (C) says it emits light only when reverse biased, which is wrong. Option (C).
Final Answer:
Statement C is not correct. \[ \boxed{\text{(C)}\ \text{(C)}} \]
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