First slide

Radiation

Question

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

Moderate

A

Stefan's law
B

Wien's displacement law
C

Kirchoff's law
D

Newton's law of cooling

Solution

Wein's displacement law, $λ_{m} T = constant$
$\Rightarrow λ_{m} is directly proportional to \frac{1}{T}$
so as temperature increases $λ$ decreases.

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