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# Calculation of the constants of Planck's radiation equation: An extension of the theory of least squares (eBook)

## by NIST Research Library(Author)

• 3,899 Words

During the past few years several methods have been proposed for determining from experimental measurements the constants of Planck's equation for the distribution of energy in the spectrum of a uniformly heated enclosure or black body. The equation is E = /b c/ /sub 1/ lambda /sup -5/(/b e/(/sup c/sub 2// lambda thetas /)-1)/sup -1/, where E is a measure of the energy, lambda the wave-length, thetas the absolute temperature, /b c/ /sub 1/ a constant depending on the units in which E is measured and giving the scale of ordinates, and /b c/ /sub 2/ a constant which affects the shape of the curve and is sometimes called the "constant of spectral rad

During the past few years several methods have been proposed for determining from experimental measurements the constants of Planck's equation for the distribution of energy in the spectrum of a uniformly heated enclosure or black body. The equation is E = /b c/ /sub 1/ lambda /sup -5/(/b e/(/sup c/sub 2// lambda thetas /)-1)/sup -1/, where E is a measure of the energy, lambda the wave-length, thetas the absolute temperature, /b c/ /sub 1/ a constant depending on the units in which E is measured and giving the scale of ordinates, and /b c/ /sub 2/ a constant which affects the shape of the curve and is sometimes called the "constant of spectral rad

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