Question

If the wavelengths of maximum intensity of radiation emitted by sun and moon are 0.5 × 10^–6metre and 10^–4metre respectively, the ratio of their temperature is –

• A. $\frac{1}{100}$
• B. $\frac{1}{200}$
• C. 100
• D. 200

Answer 1

Answer: (D)

200

Answer 2

l_s = 0.5 × 10^–6, l_m = 10^–4

\ $\frac{T_{s}}{T_{m}} = \frac{\lambda_{m}}{\lambda_{s}} = \frac{10^{- 4}}{0.5} \times 10^{6} = \frac{100}{0.5} \times 10$= 200