A p-n photodiode is fabricated from a semiconductor with band gap of 2.8eV . Can it detect a wavelength of 6000nm ?
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A p-n photodiode is fabricated from a semiconductor with band gap of 2.8eV . Can it detect a wavelength of 6000nm ?
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The energy of a signal of wavelength 6000 nm is 0.207 eV, which is less than 2.8 eV − the energy band gap of a photodiode. Hence, the photodiode cannot detect the signal.

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