Question

The intensity of radiation emitted by the sun has its maximum value at a wavelength of $510\mspace{6mu} nm$ and that emitted by the north star has the maximum value at $350 ⥂ \mspace{6mu} nm$. If these stars behave like black bodies, then the ratio of the surface temperature of the sun and north star is [IIT 1997 Cancelled;

JIPMER 2000; AIIMS 2000]

• A. 1.46
• B. 0.69
• C. 1.21
• D. 0.83

Answer 1

Answer: (B)

0.69

Answer 2

$\frac{T_{S}}{T_{N}} = \frac{(\lambda_{N})_{\max}}{(\lambda_{S})_{\max} = \frac{350}{510} = 0.69}$