Exam-style question
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If a star is at a distance of 10 parsecs, what is its parallax angle in arcseconds?.
- A.0.1 arcseconds
- B.1 arcsecond
- C.10 arcseconds
- D.100 arcseconds
Model answer
What a good answer should say
- 0.1 arcseconds
Explanation
Why this works
Formula: d = 1/p. Substitution: d = 10 parsecs.
Working: 10 = 1/p → p = 1/10 = 0.1. Answer: 0.1 arcseconds.
Units/conclusion: The parallax angle is 0.1 arcseconds.
Common mistake
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