Physics

Problem

Star A has surface temperature

6000\;\text{K}

and radius

R

. Star B has surface temperature

8000\;\text{K}

and radius

0.5R

. Treating both stars as perfect blackbodies, what is the ratio of their total radiant powers (luminosities)

\dfrac{P_B}{P_A}

? a) 1.58 b) 0.79 (approximately) c) 0.44 d) 1.33