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Wien displacement law:
For blackbody, the product of the wavelength equivalent to the maximum radiancy and the thermodynamic temperature is a constant, the Wien displacement law constant. Consequently, as the temperature grow the maximum of the radiant energy shifts to the shorter wavelength (higher frequency and energy) end of the spectrum.
N-Type Substances: When a small quantity of Arsenic or Phosphorous (group VA elements) is added to silicon or Germanium, it becomes good conductor of negative charges, such a s
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