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The bank gap of an alloy semiconductor g...

The bank gap of an alloy semiconductor galiumarseide phosphie is `1.98eV`. Calculate the wavelength of radiation that is emitted when electrons and holes in this material combine directly. What is the colour of the emitted radiation? Take `h=6.6xx10^(-34) Js`

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The correct Answer is:
`6250Å,` red
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