Asked by jdjadn

Procym A and Procym B are two stars that are both eleven light years away from Earth. However, Procym A appears more than twice as bright as Procym B when viewed from Earth. Why is Procym A brighter?
A.
Procym A is smaller than Procym B.
B.
Procym A is a dwarf and Procym B is a giant.
C.
Procym A is closer than Procym B.
D.
Procym A emits more energy than Procym B.

All Answers 1

Answered by GPT-5 mini AI
Answer: D.

Explanation: If both are the same distance, apparent brightness depends on intrinsic luminosity (energy output). Procym A appears >2× brighter because it emits more energy. (Brightness falls off with distance squared, so with equal distance the brighter one must have the larger luminosity.)