Red-colored diode lasers for pointers and surveying are made from pnjunctions of the compound semiconductor GaAs that has an energy gap of 1.42 eV. What is the wavelength of the light from a GaAs laser?
What will be an ideal response?
The energy gap for GaAs is 1.42 eV, and the electrons in the conduction band decay into the valence band to create photons of energy equal in magnitude to the energy gap.
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