Star A has a surface temperature of 5800 K, and a radius of 1 solar radius. Star C has a surface temperature of 11600 K and is 100 times less luminous than Star A. What is its radius?|||Luminosity L is proportional to R^2 T^4. So we can write:
L_C/L_A = (R_C/R_A)^2 (T_C/T_A)^4 =%26gt;
0.01 =(R_C/R_Sun)^2 (11,600/5,800)^4 =%26gt;
(R_C/R_Sun)^2 = 0.01/16 =%26gt;
R_C =0.025 R_Sun
So it seems that star C is a white dwarf.
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