Three photo diodes D1, D2and D3 are made of semiconductors having band gaps of 2.5 eV, 2 eV and 3 eV, respectively. Which ones will be able to detect light of wavelength 6000 Å ?
Three photo diodes D1, D2and D3 are made of semiconductors having band gaps of 2.5 eV, 2 eV and 3 eV, respectively. Which ones will be able to detect light of wavelength 6000 Å ?
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1 Answer
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This is a Short Answer Type Questions as classified in NCERT Exemplar
Explanation- E=hc/ = = 2.06eV
The incident radiation which is detected by the photodiode having energy should be greater
Than the band-gap. So, it is only valid for diode D2.Then, diode D2 will detect this radiation.
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