Question

If wavelengths of maximum intensity of radiations emitted by the sun and the moon are $0.5 \times 10^{- 6}m$ and $10^{- 4}m$ respectively, the ratio of their temperatures is

• A. 1/100
• B. 1/200
• C. 100
• D. 200

Answer 1

Answer: (D)

200

Answer 2

$\lambda_{m}T$ =constant ⇒$\frac{T_{1}}{T_{2}} = \frac{\lambda_{2}}{\lambda_{1}}$⇒$\frac{10^{- 4}}{0.5 \times 10^{- 5}}$=200.