First slide

Radiation

Question

The plots of intensity versus wavelength for three black bodies at temperature T₁, T₂ and T₃ respectively are as shown. Their temperatures are such that

Moderate

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

According to Wien's law
$λT = constant$
From graph $λ_{1} < λ_{3} < λ_{2}$
$∴ T_{1} > T_{3} > T_{2}$

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