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 ...........
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(b)
$\int \limits_0^{\infty} e_\lambda d \lambda=$ area under the graph of $e_\lambda$ and $\lambda$
also it gives total radiated average power per unit surface area which is called total intensity of radiation.
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