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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Sandhya Khade posted an Question
December 26, 2019 • 04:38 am
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15 points
15 points
- CSIR NET
- Physical Sciences
Equency v Estimate the surface temperature of a star if the radiation it emits has a maimum intansity length of 446 nm. VWhat is the intensity radiated by the s
equency v Estimate the surface temperature of a star if the radiation it emits has a maimum intansity length of 446 nm. VWhat is the intensity radiated by the star 2 Gen A 446 nm Lsing Wien's displacement law 0.288 cm-k 288 10 cm-k cm T 446x 10 cm yeak T-6500 K Using Stefan- Boltzmann law, total intensity radiated by star PsOT' = 5.67 x 10- x (6500 P-101.2x 10° Wm
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Paltu Sen
A radiating star can be taken as a radiating blackbody. Different wavelengths of this radiation have different intensities that only depends on the temperature of the body. The wavelength of maximum intense radiation is inversely proportional to its temperature , according to Wien's displacement law. This law is here used to calculate temperature of the star. Using this temperature Stefan Boltzman law is used to calculate intensity of this radiation..
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Dr. manish kumar gupta
These formulae belongs to Black body radiation concept (prior to quantum physics stage), pls refer basic quantum physics books.
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Sandhya khade
please explain
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Sandhya khade
please explain how answer is calculated I don't understand
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Somnath
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Paltu Sen![best-answer]()
A radiating star can be regarded as a radiating blackbody. A blackbody radiates wavelengths from zero to infinity. Different wavelengths of blackbody radiation have different intensities that only depend on the temperature of the body (see blackbody radiation curve). The wavelength of maximum intense radiation (lambda)is inversely proportional to its temperature(T). According to Wien's displacement law lambda*T= 0.288cm-K. This law is here used to calculate temperature of the star by using the its wavelength of radiation. Note the wavelength given here is that of maximum intense radiation. From this temperature Stefan Boltzman law which relates the temperature of a blackbody and intensity of its radiation, is used to calculate intensity of this radiation.. For better understanding of blackbody radiation consult any good book on quantum mechanics.