First slide

Radiation

Question

The plots of spectral radiancy $(R_{λ})$ versus wave length $(λ)$ for three black bodies at temperatures $T_{1}, T_{2} a n d T_{3}$ respectively are shown. Their temperatures are such that

Easy

A

$T_{1} > T_{2} > T_{3}$
B

$T_{1} > T_{3} > T_{2}$
C

$T_{2} > T_{3} > T_{1}$
D

$T_{3} > T_{2} > T_{1}$

Solution

By Wien’s displacement Law, at maximum intensity $λ T =$ constant. Since
$λ_{1} < λ_{3} < λ_{2},$ we can conclude, $T_{1} > T_{3} > T_{2} .$

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