Exam-style question
Try this first
What is defined as the luminosity of a star?.
- A.The brightness observed from Earth
- B.The power output of a star
- C.The distance of a star from Earth
- D.The temperature of a star's surface
Model answer
What a good answer should say
- The power output of a star
Explanation
Why this works
Luminosity is specifically defined as the total power output emitted by a star in all directions. This is distinct from brightness, which is how we perceive the star's light from a distance.
Common mistake
No common mistake is linked to this question yet.