Exam-style question
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How does the radius of a star affect its radiation output?.
- A.Larger radius leads to lower radiation output.
- B.Larger radius leads to higher radiation output.
- C.Radius has no effect on radiation output.
- D.Radiation output is only dependent on temperature.
Model answer
What a good answer should say
- Larger radius leads to higher radiation output.
Explanation
Why this works
A star's radiation output increases with its surface area, which is proportional to the square of its radius. Therefore, a larger radius results in greater radiation output, assuming constant temperature.
Common mistake
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