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(A) According to Wien's displacement law, the product of the wavelength corresponding to maximum intensity $(\lambda_{m})$ and the absolute temperatur

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Wien's displacement Law

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(A) According to Wien's displacement law, the product of the wavelength corresponding to maximum intensity $(\lambda_{m})$ and the absolute temperature $(T)$ of the black body is a constant.$\lambda_{m} T = b$ (constant)This implies $\lambda_{m} \propto \frac{1}{T}$.As the temperature $(T)$ of the iron piece increases, the wavelength $(\lambda_{m})$ of the emitted radiation decreases. Initially, the iron emits longer wavelengths (dull red), and as it gets hotter, it shifts toward shorter wavelengths (yellow and eventually white, which contains all visible colors), confirming the observation.

$A$ piece of iron is heated in a flame. It first becomes dull red, then becomes reddish yellow, and finally turns to white hot. The correct explanation for the above observation is possible by using:

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