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pallavi pradeep bhardwaj Grade: 12
        The temp of the furnance is 2324 degree celcius and intensity is maximum in the radiation spectrum nearly at 12000 angstrom.If the intensity in the spectrum of a star is maximum nearly at 4800 angstrom then surface temp of a star is.
7 years ago

Answers : (1)

AskIITians Expert Hari Shankar IITD
17 Points
										

There is an inverse relationship between the wavelength of the peak of the emission of a black body and its temperature, and this less powerful consequence is often also called Wien's displacement law

\lambda_{\mathrm{max}} = \frac{b}{T}
where



    λmax is the peak wavelength in meters,

    T is the temperature of the blackbody in kelvins (K), and

    b is a constant of proportionality




We can consider the star and the furnace both as blackbodies for this question.


(λmax)(T) = b in both cases.


Theresfore, (λmax)(T) for the furnace = (λmax)(T) for the star


Then, for the furnace, λmax = 12000 A = 1.2e-6 m and T =2324 C = 2597 K


For the star, (λmax) = 4800 A = 4.8e-7 m


Hence , Tstar = (1.2e-6)(2597)/(4.8e-7) = 6492.5 K


 

7 years ago
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