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Q. If a graph is plotted by taking spectral emissive power along y-axis and wavelength along x-axis then the area below the graph above wavelength axis is

Thermal Properties of Matter

Solution:

$\int\limits_{0}^{\infty} e_{\lambda} d \lambda=\text { area under the graph of } e_{\lambda} \text { and } \lambda$
also it gives total radiated average power per unit surface area which is called total intensity of radiation.