First slide

Radiation

Question

The light from the sun is found to have a maximum intensity near 470 nm. Assuming the surface of the sun behaves as a black body. the temperature of sun will be

Moderate

A

6165 K
B

6000 K
C

6420 K
D

5980 K

Solution

According to Wien's displacement law
$\begin{aligned} λ_{m} T = b where b = 0 \cdot 002898 mK \\ ∴ T = \frac{0 \cdot 002898}{470 \times 10^{- 9}} = 6165 K \end{aligned}$

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