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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.

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 [2013] (a) Wien's displacement law (b) Kirchoff's law (c) Newton's law of cooling (d) Stefan's law

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