Planck's radiation law gives the spectral radiancy R as a function of the wave length A and temperature T (in kelvins):

where c = 3.0 × 108 m/s is the speed of light, h = 6.63 × 10-34 J s is Planck's constant, and k = 1.38 × 10-23 J/K is the Boltzmann's constant.
Plot R as a function of λ for 0.2 × 10-6

Transcribed Image Text:

2nc?h R 1 (kc)/(T) 1