AIPMT MAINS2009Physics-Semiconductors
AIPMT MAINS 2009 Physics Photodiodes MCQ Question
Type: MCQ-numerical-Medium-Class 12
A p-n photodiode is fabricated from a semiconductor with a band gap of 2.5 eV. It can detect a signal of wavelength:
A
4000 nₘ
B
6000 nₘ
C
4000 Å
D
6000 Å
Correct Answer
Option C
Detailed Explanation
The energy of a photon is given by E = hc/λ. For a band gap of 2.5 eV, the wavelength λ = hc/E = 1240/2.5 ≈ 4960 Å. Thus, 4000 Å is detectable.
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