The spectral emissive power \(E_\lambda\) for a body at temperature \(T_1\) is plotted against t....

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The spectral emissive power \(E_\lambda\) for a body at temperature \(T_1\) is plotted against the wavelength 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 \(\lambda_1 / \lambda_2=\)
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