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(D) The graph shows the spectral emissive power $(E_{\lambda})$ on the y-axis and wavelength $(\lambda)$ on the x-axis.The area under the curve is giv

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the total energy emitted per unit time per unit area by the black body at all wavelengths.

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(D) The graph shows the spectral emissive power $(E_{\lambda})$ on the y-axis and wavelength $(\lambda)$ on the x-axis.The area under the curve is given by the integral $\int_{0}^{\infty} E_{\lambda} d\lambda$.According to the definition of spectral emissive power,this integral represents the total radiant energy emitted per unit time per unit surface area of the black body across all possible wavelengths.This is consistent with the Stefan-Boltzmann Law,which states that the total power radiated per unit area is proportional to the fourth power of the absolute temperature $(E = \sigma T^4)$.

The following graph represents the radiant power versus wavelength of a black body. The area under the curve represents:

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