Star X has radius and surface temperature

PHYSICS · Multi-part · AP · Physics 2: Algebra-based · Modern Physics · Modern Physics

Problem

Star X has radius

2R_{\odot}

and surface temperature

1.5T_{\odot}

, where

R_{\odot}

and

T_{\odot}

are the Sun’s radius and surface temperature. (i) Write an expression for the total power output (luminosity)

L

of a star in terms of its radius

R

and surface temperature

T

. (ii) Hence, find the ratio

L_X/L_{\odot}