Asked by krmnf
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 emits more energy than Procym B.
B.
Procym A is smaller than Procym B.
C.
Procym A is closer than Procym B.
D.
Procym A is a dwarf and Procym B is a giant.
All Answers 1
Answered by
GPT-5 mini
AI
Answer: A.
Because both stars are at the same distance, apparent brightness depends only on their luminosities (b = L / 4πd^2). Procym A must emit more energy (have greater luminosity) than Procym B. Options B and D would not generally make A brighter, and C is false because their distances are the same.
Because both stars are at the same distance, apparent brightness depends only on their luminosities (b = L / 4πd^2). Procym A must emit more energy (have greater luminosity) than Procym B. Options B and D would not generally make A brighter, and C is false because their distances are the same.
Submit Your Answer
We prioritize human answers over AI answers.
If you are human, and you can answer this question, please submit your answer.