First slide

Radiation

Question

Two stars A and B radiate maximum energy at the wavelength of 360 nm and 480 nm, respectively. Then, the ratio of the surface temperatures of A and B is

Moderate

A

3 : 4
B

81 : 256
C

4: 3
D

256: 81

Solution

According to Wien's displacement law,
$λ T = constant$
$∴ \frac{T_{1}}{T_{2}} = \frac{λ_{2}}{λ_{1}} = \frac{480}{360} = \frac{4}{3}$

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