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  • Three photo diodes D1, D2 and D3 are made of semiconductors having band gaps of 2.5eV, 2eV and 3eV, respectively. Which ones will be able to detect light of wavelength

 Three photo diodes D1, D2 and D3 are made of semiconductors having band gaps of 2.5eV, 2eV and 3eV, respectively. Which ones will be able to detect light of wavelength A^{\circ}

Answers (1)

According to the problem,

Wavelength of light \lambda = 6000 A^{\circ}-6000\times 10^{10}m

Energy of the light photon

E=\frac{h_{c}}{\lambda}=\frac{6.62\times10^{-34}\times3 \times 10^{8}}{6000\times10^{10}\times1.6\times10^{19}}eV=2.06eV

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