secondRadiation
Second radiation constant
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Second radiation constant in blackbody theory
secondRadiation is the second radiation constant used in Planck’s law for blackbody spectral radiance. It combines the Planck constant, speed of light, and Boltzmann constant.
Use
It appears in the exponential wavelength-temperature term of thermal-radiation formulas. See firstRadiation, boltzmann, and planckConstant.
Caveats
Keep wavelength and temperature units consistent. For peak-wavelength estimates, use wienDisplacement instead of manually optimizing Planck’s law.
Use Second Radiation in a calculation
Enter secondRadiation on a calculator line to see its built-in value, or place the name inside a longer expression. Keep any displayed unit attached when converting or combining physical quantities, and check that every other value uses a compatible dimension.
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