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(D) According to Wien's displacement law, the wavelength corresponding to the maximum intensity of emission $(\lambda_m)$ is inversely proportional to

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Wien's displacement Law

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(D) According to Wien's displacement law, the wavelength corresponding to the maximum intensity of emission $(\lambda_m)$ is inversely proportional to the absolute temperature $(T)$ of the body, given by $\lambda_m T = b$, where $b$ is Wien's constant.As the temperature of the iron rod increases, the wavelength of the emitted radiation decreases.Initially, at lower temperatures, the emitted radiation is in the red part of the visible spectrum.As the temperature increases further, the peak wavelength shifts towards shorter wavelengths (yellow, then blue, and finally white), which is a combination of all visible wavelengths.Thus, the change in colour is explained by Wien's displacement law.

When an iron rod is heated, the variation of colour from dull red to white can be explained by

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