First slide

Radiation

Question

What is the approximate surface temperature of a Yellow star? Wiens's constant = 0.288 cmK

Easy

A

$3942^{o} C$
B

$2984^{o} C$
C

$4963^{o} C$
D

$5814^{o} C$

Solution

Wavelength of yellow light is $5500 \overset{o}{A}$ . By Wien's displacement law
$λ T = b \Rightarrow T = \frac{b}{λ} = \frac{0.288 \times 10^{8}}{5500} \overset{o}{A} = 5236^{o} K = 4963^{0} C$

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