Q107 / 180 · NEET 2013 (All India) · Physics

A piece of iron is heated in a flame. If 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
Stefan's law
Correct answer
B
Wien's displacement law
C
Kirchoff's law
D
Newton's law of cooling

Solution

The equation of Wien's displacement law, i.e., $\lambda_m T=$ constant.

Hence, the correct answer is option: 'B'.

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