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Q.

A piece of iron is heated in a flame. If at first it 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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a

Stefan's law

b

Wien's displacement law

c

Kirchhoff's law

d

Newton's law of cooling

answer is B.

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Detailed Solution

The equation of Wien's displacement law, i.e. λmT= constant.
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A piece of iron is heated in a flame. If at first it becomes dull red, then becomes reddish, yellow and finally turns to white hot. The correct explanation for the above observation is possible by using