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In addition to thermal energy, one can also use photons to impart energy to Si so...

In addition to thermal energy, one can also use photons to impart energy to Si so that some electrons from the valence band can jump over to the conduction band. What is the maximum wavelength of the light that can be used to excite an electron from the valence band to the conduction band of Si at 300K? The same electrons can fall back to the valence band giving out the energy as radiation. Calculate the wavelength of the light emitted if the material is Si. Is this in the visible region or in the infrared region?

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