A LED emits visible light when its (a) junction is hot. (b) holes and electrons recombine. (c) depletion region widens. (d) junction is reverse biased.

Answer: (b). In a forward-biased LED, electrons from the n side and holes from the p side meet at the junction. When they recombine, energy about equal to Eg is released as a photon. So the answer is (b) holes and electrons recombine.

A LED emits visible light when its | MHT CET 2026 (12 May, Shift 1)

Q4MHT CET 2026 · 12 MAY · SHIFT 1Easy

Special Purpose Diodes

A LED emits visible light when its

Show answer and solution

Answer: (b)

In a forward-biased LED, electrons from the n side and holes from the p side meet at the junction.
When they recombine, energy about equal to $E_g$ is released as a photon.
So the answer is (b) holes and electrons recombine.

Report a mistake

More questions on Special Purpose Diodes

Which one of the following statements is 'WRONG' regarding LED?MHT CET 2026 (18 Apr, Shift 1)
Which of the following statement is NOT correct in the case of LED? (A) It is a heavily…MHT CET 2026 (16 Apr, Shift 2)
Photodiode is a deviceMHT CET 2026 (15 Apr, Shift 1)
The material used for solar cell should have band gap (A) equal to zero. (B) equal to…MHT CET 2026 (19 Apr, Shift 1)
In the following circuit, the current through the Zener diode isMHT CET 2026 (19 May, Shift 1)
The Zener diode has reverse breakdown voltage VZ. The current through the load resistance…MHT CET 2026 (15 May, Shift 2)
An ideal Zener diode with breakdown voltage of -3 V is reverse biased with a negative…NEET 2026 (Re-neet)
The following diagram shows a Zener diode as a voltage regulator. The Zener diode is…JEE Main 2026 (23 Jan, Shift 1)

Special Purpose Diodes question from MHT CET 2026 (12 May, Shift 1)

More questions on Special Purpose Diodes