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Questions  

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 

a
Stefan's law
b
Wien's displacement law
c
Kirchhoff's law
d
Newton's law of cooling

detailed solution

Correct option is B

The equation of Wien's displacement law, i.e. λmT= constant.

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