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A p-n photodiode is fabricated from a semiconductor with a band gap of 2.5 eV. It can detect a signal of wavelength
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- 4000 nm
- 6000 nm
- 4000 Å
- 6000 Å
Correct Option: C
| λmax = | E |
| = | ≃ 5000 Å | 2.5 × 1.6 × 10-19 |
The wavelength detected by photodiode should be less than λmax .
Hence it can detect a signal of wavelength 4000 Å.
