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  4. 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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Q. 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 :

NEETNEET 2013Thermal Properties of Matter

Solution:

We can explain this observation by using $\lambda_m T = b$ .Which is Wien's displacement law.