AIPMT MAIN2008Physics-Semiconductors
AIPMT MAIN 2008 Physics Photodiodes MCQ Question
Type: MCQ-conceptual-Medium-Class 12
A p-n photodiode is made of a material with a band gap of 2.0 eV. The minimum frequency of the radiation that can be absorbed by the material is nearly
A
20 × 10¹⁴ Hz
B
10 × 10¹⁴ Hz
C
5 × 10¹⁴ Hz
D
1 × 10¹⁴ Hz
Correct Answer
Option C
Detailed Explanation
The frequency of the radiation is given by ν = E/h, where E is the energy band gap and h is Planck's constant. Substituting the values, ν = 2.0 eV / 4.135667696 × 10⁻¹⁵ eV·s ≈ 5 × 10¹⁴ Hz.
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