AIPMT PRELIMS 2009 Physics Photodiodes MCQ Question with Solution

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 maximum wavelength $\lambda_{max}$ that can be detected is given by $\lambda_{max} = \frac{hc}{E}$ . For a band gap of 2.5 eV, $\lambda_{max} \approx 5000$ Å. Since 4000 Å is less than 5000 Å, it can be detected.

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AIPMT PRELIMS 2009 Physics Photodiodes MCQ Question

Correct Answer

Detailed Explanation

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