Exam-style question
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If a star is at 1 parsec, what is its parallax angle?.
- A.1 arcsecond
- B.0.5 arcsecond
- C.2 arcseconds
- D.10 arcseconds
Model answer
What a good answer should say
- 1 arcsecond
Explanation
Why this works
Formula: d = 1/p. Substitution: d = 1 parsec.
Working: 1 = 1/p → p = 1. Answer: 1 arcsecond.
Units/conclusion: The parallax angle at 1 parsec is 1 arcsecond.
Common mistake
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