First slide

Radiation

Question

Shown below are the black body radiation curves at temperatures $T_{1} and T_{2} (T_{2} > T_{1})$ . Which of the following plots is correct?

Easy

A
B
C
D

Solution

According to Wein's displacement law
$λ_{m} \propto \frac{1}{T} \Rightarrow λ_{m 2} < λ_{m} (∵ T_{1} < T_{2})$
Therefore, I- $λ$ graph for $T_{2}$ have lesser wavelength( $λ_{m}$ ) and so curve for $T_{2}$ will shift towards left side.

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