A red supergiant star is found to have a surface temperature of 2500 K and a luminosity 100,000 times that of the Sun.Use the Hertzsprung-Russell diagram in Figure 10-8 of Comins,Discovering the Essential Universe,6th ed.,to determine its approximate radius compared with that of the Sun.
A) about 10 times larger
B) about 100 times larger
C) about 1000 times larger
D) almost the same

Question

Quizplus · Accepted Answer

A red supergiant with a surface temperature of 2500 K and a luminosity 100,000 times that of the Sun would have a radius approximately 1000 times larger than the Sun, as indicated by its position on the Hertzsprung-Russell diagram.

A Red Supergiant Star Is Found to Have a Surface