A star that is hot and has low luminosity must have ___________________.
A) a very large radius
B) a very small radius
C) a very small mass
D) a very great distance
E) a very low velocity

Question

Quizplus · Accepted Answer

A hot star with low luminosity must have a small radius because luminosity depends on both temperature and surface area. A small radius would result in a smaller surface area, thus lower luminosity despite high temperature.

A Star That Is Hot and Has Low Luminosity Must