Two stars, one classified A4 V and the other F8 V, have the same apparent magnitude. There is no significant amount of absorption of starlight by interstellar material. From this information one knows that the A4 V star is _____ the F8 V star.
A) farther from the Sun than
B) at the same distance from the Sun as
C) smaller than
D) closer to the Sun than

Question

Quizplus · Accepted Answer

The A4 V star is hotter and more luminous than the F8 V star. For them to have the same apparent magnitude, the A4 V star must be farther away, as its intrinsic brightness is compensated by a greater distance.

Two Stars, One Classified A4 V and the Other F8