Two stars, A and B, have the same temperature, but star A is 4 times larger in diameter than star B. Which of these statements about these stars is true?
A) Stars A and B emit the same flux.
B) Stars A and B emit the same total amount of energy per second.
C) Star A emits 4 times the flux that star B emits.
D) Star A emits 16 times the flux that star B emits.

Question

Quizplus · Accepted Answer

Since both stars have the same temperature, they emit the same flux per unit area. However, star A, being 4 times larger in diameter, has a surface area 16 times greater than star B, leading to star A emitting 16 times the total energy, not flux, of star B.

Two Stars, a and B, Have the Same Temperature, but Star