STANDARDPhysics-Semiconductors
STANDARD Physics Photo diodes MCQ Question
Type: MCQ-conceptual-Medium
Three photo diodes D₁, D₂ and D₃ are made of semiconductors having band gap of 2.5 eV, 2 eV and 3 eV, respectively. Which one will be able to detect light of wavelength 6000 Å?
A
D₁
B
D₂
C
D₃
D
D₁ and D₂ both
Correct Answer
Option B
Detailed Explanation
The energy of the incident photon is calculated using E = hc/λ. For λ = 6000 Å, E = 2.06 eV. A photodiode can detect radiation if the energy of the photon is greater than the band gap. Since D₂ has a band gap of 2 eV, it can detect the radiation.
Found an issue with this question?