AIPMT PRELIMS2008Physics-Semiconductors
AIPMT PRELIMS 2008 Physics Photodiodes MCQ Question
Type: MCQ-numerical-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
1 × 10¹⁴ Hz
B
2 × 10¹⁴ Hz
C
10 × 10¹⁴ Hz
D
5 × 10¹⁴ Hz
Correct Answer
Option D
Detailed Explanation
The energy of the photon must be equal to or greater than the band gap energy. Using E = hf, the minimum frequency is calculated as 5 × 10¹⁴ Hz.
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