NEET 2009 Physics question

Not in JEE Advanced syllabus

A p-n photodiode is fabricated from a semiconductor with a band gap of 2.5 eV. It can detect a signal of wavelength:

Answer: (3)

Solution

A photodiode responds only when the photon energy is at least the band gap: , i.e. . (about 496 nm). Only

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Question ID VK-090145