If Eg is the energy gap of semiconductor expressed in electron volt,the wavelength of light emitted by LED is___________.
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In case of insulators, the value of Eg varies from 3 to 7 eV. However, for semiconductors, it is quite small. For example, in case of germanium, Eg = 0.72 eV and in case of silicon, Eg = 1.1 eV. In semi-conductors at low temperatures, there are few charge carriers to move, so conductivity is quite low.
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