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Physics NCERT Exemplar Solutions Class 12th Chapter Fourteen Physics Class 12th Semiconductor Electronics

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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alok kumar singh | Contributor-Level 10

4 months ago

This is a Short Answer Type Questions as classified in NCERT Exemplar

Explanation- E=hc/ $λ$ = $\frac{6.6 \times 10^{- 34} \times 3 \times 10^{8}}{6000 \times 10^{- 10} \times 1.6 \times 10^{- 19}}$ = 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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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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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 ?