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emittanceblackbodyPlanck emittance of a black body of temperature T at a given wavelength (in metres).
emittanceblackbodyPlanck
emittanceblackbodyPlanck(wlnm, T)
wavelength in nm
temperature in Kelvin
emittance
Planck's radiation law https://en.wikipedia.org/wiki/Planck%27s_law
# NOT RUN { emittanceblackbodyPlanck(555,2000) # }
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