Star X has radius and surface temperature

PHYSICS · Single correct · AP · Physics 2: Algebra-based · Modern Physics · Modern Physics

Problem

Star X has radius

2R_{\odot}

and surface temperature

4000\,\text{K}

. Star Y has radius

R_{\odot}

and surface temperature

8000\,\text{K}

. What is the ratio of their total power outputs

P_Y/P_X

? (a)

8

(b)

1

(c)

4

(d)

2