An aluminum gallium phosphide (AlGaP) semiconductor has a bandgap of 2.33 eV.  Which of the following photon wavelengths is the only one that CANNOT promote an electron from a AlGaP valence band to the conduction band? 574 nm 490 nm 310 nm 388 nm There is no correct answer

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An aluminum gallium phosphide (AlGaP) semiconductor has a bandgap of 2.33 eV.  Which of the following photon wavelengths is the only one that CANNOT promote an electron from a AlGaP valence band to the conduction band?


574 nm
490 nm
310 nm
388 nm
There is no correct answer
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