First slide

Radiation

Question

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

Easy

A

Stefan's law
B

Wien's displacement law
C

Kirchhoff's law
D

Newton's law of cooling

Solution

The equation of Wien's displacement law,
$i.e. λ_{m} T = constant.$

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