Which of the following statements is correct?

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(D) According to Kirchhoff's law,a good absorber is a good emitter,so option $(A)$ is incorrect.Every body absorbs and emits radiation at all temperat

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The law showing the relation of temperatures with the wavelength of maximum emission from an ideal black body is Planck's law.

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(D) According to Kirchhoff's law,a good absorber is a good emitter,so option $(A)$ is incorrect.Every body absorbs and emits radiation at all temperatures above $0 \, K$ (absolute zero). At $0 \, K$,thermal motion ceases,so option $(B)$ is incorrect.The energy of radiation emitted from a black body varies with wavelength,as described by the black body radiation spectrum,so option $(C)$ is incorrect.Planck's law describes the spectral density of electromagnetic radiation emitted by a black body in thermal equilibrium at a given temperature $T$. The relation is given by $E_{\lambda} d_{\lambda} = \frac{8\pi hc}{\lambda^5} \frac{1}{[e^{hc/\lambda kT} - 1]} d_{\lambda}$. Therefore,option $(D)$ is correct.

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