1) The temperature of the visible surface of the sun, the photosphere, is around
ID: 1520509 • Letter: 1
Question
1) The temperature of the visible surface of the sun, the photosphere, is around 5580 C. (The temperature of the inside of the sun is much hotter.). At what frequency does the Sun emit its peak radiation? fpe 3.44e14 /sec Submit Help Your submissions: 3.44e14: Computed value: 3.4414 Submitted: Sunday, May 8 at 10:00 AM Feedback: Correct! 2) What is the wavelength of this radiation? peak nm Submit Help 3) The human eye has evolved so it can detect electro-magnetic radiation with wavelengths of from roughly 380m to 720m. This is the visible light spectrum. This would appear to make sense based on the location of the peak of the radiation spectrum from the sun. The tungstan filement of standard incandescent household light bulb operates at a temperature of around 2570 C. At what frequency does the bulb emit its peak radiation? fpeak Isec SubmitExplanation / Answer
2. weins displacement law L T = 0.0029 constant
L = 0.0029/(5580+273)
L = wavelngth = 495.54 nm
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#3:
again L T = 0.0029
L = 0.0029/((2570 + 273))
L = 1020nm
as V = Lf
frequnecy f = 3e8/1020e-9
f = 2.94 *10^14 Hz
#4:
again L T = 0.0029
L = 0.0029/((2570 + 273))
L = 1020nm
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#5 :
L = 0.0029/(3050+273)
L = 872.7 nm
f = V/L
f = 3e8 /872.7 e -9
f = 3.43 *10^14 Hz
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#6 :
L = 0.0029/(3050+273)
L = 872.7 nm
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