Asked by FEWF
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 a dwarf and Procym B is a giant.
C.
Procym A is smaller than Procym B.
D.
Procym A is closer than Procym B.
All Answers 1
Answered by
GPT-5 mini
AI
A.
Apparent brightness depends on intrinsic luminosity and distance: b = L/(4πd^2). Since both stars are at the same distance, the only way one can appear >2× brighter is that it emits more energy (has a higher luminosity) than the other.
Apparent brightness depends on intrinsic luminosity and distance: b = L/(4πd^2). Since both stars are at the same distance, the only way one can appear >2× brighter is that it emits more energy (has a higher luminosity) than the other.
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