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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:
A
Newton's Law of cooling
B
Stefan's Law
C
Wien's displacement Law
D
Kirchhoff's Law
Detailed Solution
The observation is explained by $\lambda_mT = b$, which is Wien's displacement law: as temperature rises the peak wavelength shifts to shorter values.