A piece of iron is heated in a flame. It first becomes dull red then becomes reddish yellow and fina

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10-2.Transmission of Heat

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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

A

Wien’s displacement Law

B

Kirchhoff’s Law

C

Newton’s Law of cooling

D

Stefan’s Law

Solution

Wein's displacement law, $\lambda_{m} T=$ constant

$\Rightarrow \lambda_{m} \propto \frac{1}{T}$

so as temperature increases $\lambda$ decreases.

Standard 11

Physics

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