First slide

Radiation

Question

The maximum wavelength of radiation emitted at 2000 K is 4 $μ$ m. What will be the maximum wavelength of radiation emitted at 2400 K

Easy

A

$3.33 μm$
B

$0.66 μm$
C

$1 μm$
D

1 m

Solution

According to Wien's law
$λ_{m} T = constant$
$\begin{array}{l} 4 \times 2000 = {λ_{m}}^{'} \times 2400 \\ {λ_{m}}^{'} = \frac{4 \times 2000}{2400} = 3 \cdot 33 μm . \end{array}$

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