The spectral emissive power E λ for a body at temperature T 1 is plotted against the wavelength (see figure) and area under the curve is found to be A . At a different temperature T 2 the area is found to be 9 A . Then λ 1 / λ 2 =

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Correct answer: D. 3

E 1 E 2 = 1 9 = T 1 T 2 4 &#955; 1 T 1 = &#955; 2 T 2 &#8658; T 1 T 2 = &#955; 2 &#955; 1 1 9 = &#955; 2 &#955; 1 4 &#8658; &#955; 2 &#955; 1 = 1 3 &#955; 1 &#955; 2 = 3

The spectral emissive power E λ for a body at temperature T 1 is plotted against the wavelength (see figure) and area under the curve is found to be A . At a different temperature T 2 the area is found to be 9 A . Then λ 1 / λ 2 =

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