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Grade 12Thermal Physics

The spectral emissive power E_? for a body at temperature T₁ is plotted against the wavelength and area under the curve is found to be A. At a different temperature T₂, the area is found to be 9A. Then ?₁/?₂

Question image for The spectral emissive power E ? for a body at tem

arpit

8 Years agoGrade 12

1 Answer

Arun

8 Years ago

Dear Arpit

E1 / E2 = 1/ 9 = (T1/ T2)⁴

hence

T1/ T2 = 1 / $\small \sqrt$ 3

Now

As we know, from wein’s formula –

$\small \lambda$ T = constant

Hence

$\small \lambda$ 1 / $\small \lambda$ 2 = T2 / T1

$\small \lambda$ 1 / $\small \lambda$ 2 = $\small \sqrt$ 3

Regards

Arun (askIITians forum expert)

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