According to Planck's law of black- body radiation, the spectral energy density R as a function of wavelength A (m) and temperature T (K) is given by: 2nc h R = 1 hc/NkT e -1 where c=3x10° m/s is the sneed of 8 4. 3. 2. ctral Energy Density (W/m)

Elements Of Electromagnetics
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27. According to Planck's law of black-
body radiation, the spectral energy
density R as a function of wavelength A
(m) and temperature T (K) is given by:
x 1013
5.
..... T=3,000K
- -T=4,000K
-T=5,000K
2nch
1
R =
hc/T
e
-1
where c=3 x10 m/s is the speed of
-34
light, h=6.626 × 10
J-s is the Planck
0.5
1.
1.5
2.5
k = 1.38 × 10 23 J/K is
constant, and
Boltzmann constant. Make the shown figure that contains plots ofR as a
function of 2 for 0.1<)<3µm for three temperatures T=3,000 K, T=4,000
K, and T=5,000 K.
Wavelength (um)
Spectral Energy Density (W/m)
Transcribed Image Text:27. According to Planck's law of black- body radiation, the spectral energy density R as a function of wavelength A (m) and temperature T (K) is given by: x 1013 5. ..... T=3,000K - -T=4,000K -T=5,000K 2nch 1 R = hc/T e -1 where c=3 x10 m/s is the speed of -34 light, h=6.626 × 10 J-s is the Planck 0.5 1. 1.5 2.5 k = 1.38 × 10 23 J/K is constant, and Boltzmann constant. Make the shown figure that contains plots ofR as a function of 2 for 0.1<)<3µm for three temperatures T=3,000 K, T=4,000 K, and T=5,000 K. Wavelength (um) Spectral Energy Density (W/m)
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