Question-2: KNOWN: Various surface temperatures Hot Cool Surface Sun Tungsten (2500K) metal Skin metal (5800K) (1500K) (305K) (60K) FIND: (a) Wavelength corresponding to maximum emission for each surface, (b) Fraction of solar emission in UV, VIS and IR portions of the spectrum. Spectrum Wavelength limits, µm UV 0.01 0.4 VIS 0.4 0.7 IR 0.7 100 ASSUMPTIONS: (1) Spectral distribution of emission from each surface is approximately that of a blackbody, (2) The sun emits as a blackbody at 5800 K.
Question-2: KNOWN: Various surface temperatures Hot Cool Surface Sun Tungsten (2500K) metal Skin metal (5800K) (1500K) (305K) (60K) FIND: (a) Wavelength corresponding to maximum emission for each surface, (b) Fraction of solar emission in UV, VIS and IR portions of the spectrum. Spectrum Wavelength limits, µm UV 0.01 0.4 VIS 0.4 0.7 IR 0.7 100 ASSUMPTIONS: (1) Spectral distribution of emission from each surface is approximately that of a blackbody, (2) The sun emits as a blackbody at 5800 K.
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Transcribed Image Text:Question-2:
KNOWN: Various surface temperatures
Hot
Cool
Surface
Sun
Tungsten
(2500K)
metal
Skin metal
(5800K)
(1500K)
(305K) (60K)
FIND: (a) Wavelength corresponding to maximum emission for each surface, (b) Fraction of
solar emission in UV, VIS and IR portions of the spectrum.
Spectrum
Wavelength limits, um
UV
0.01 0.4
VIS
0.4 0.7
IR
0.7 100
ASSUMPTIONS: (1) Spectral distribution of emission from each surface is approximately that
of a blackbody, (2) The sun emits as a blackbody at 5800 K.
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