Question

Q1: The sun can be treated as a blackbody at an effective surface temperature of 10,400 R. The sun can be treated as a blackbody. (a) Determine the rate at which infrared radiation energy (0.76-100 um) is emitted by the sun, in Btu/hft. (b) Determine the fraction of the radiant energy emitted by the sun that falls in the visible range. (c) Determine the wavelength at which the emission of radiation from the sun peaks (d) Calculate and plot the spectral blackbody emissive power E of the sun versus wavelength in the range of 0.01 μm to 1000 μm.

Answer 1

Given-* -Temperature-ot sun CT-lo 400 R length-and _at_h inimum esature un ane 一From blackhady-radiation bunchons table- 50.547370 considexing the andl ten -product- pemahure loox 57798 577800 시mK trom blackbady sadia tion tunchon Table Exaclion at sadiation emitted etween these toa twavelenths becomes b brachon ot rediant energy emmitted by sun ーケhaftalu inthe visible range 45.3 % CamScanner

o)Fsom th to ta 乙m the Su xo, 400 7 -2.00 9: 453 E 三 0.453x 2.00 5 x 107 in eS T (に) 5778 5. OIG O o oo EES the CSScanned with

som 1 2 684. & 4 6. 3 30. 3 40. 4.3 4-63 22. S 6. 9o.I2 2 CamScanner 0.000 20 13

100000 10000 1000 E 100 E 10 0.1 0.01 0.001 0.0001 0.01 0.1 10 100 1000 10000 λ [um]