First slide

Radiation

Question

Three stars A, B and C appear as green, red and blue respectively. The star having minimum temperature is

Moderate

A

A
B

B
C

C
D

all

Solution

According to Wien's law,
$λ_{m} T = constant$
$∴ T = \frac{Constant}{λ_{m}}$
When $λ_{m}$ is maximum, 7 is minimum.
$λ_{m}$ = maximum for red and hence T is minimum.

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