Parallax Method
Easyphysics
The parallax of a celestial object is 0.5 arc seconds. What is the distance to this object in parsecs?
Select the correct option:
Solution
Incorrect! Answer:
2 pc
- Parsec Definition: 1 parsec is the distance at which the mean radius of the Earth's orbit (1 AU) subtends an angle of one second of arc.
- Formula: d(pc)=θ(arcsec)1.
- Input: θ=0.5 arc seconds.
- Calculation: d=1/0.5=2.
- Result: The distance is 2 parsecs.
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About This Question
- Subject
- physics
- Chapter
- units and measurements
- Topic
- parallax method
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
2 pc
- Parsec Definition: 1 parsec is the distance at which the mean radius of the Earth's orbit (1 AU) subtends an angle of one second of arc.
- Formula: d(pc)=θ(arcsec)1.
- Input: θ=0.5 arc seconds.
- Calculation: d=1/0.5=2.
- Result: The distance is 2 parsecs.
This easy difficulty physics question is from the chapter units and measurements, covering the topic of parallax method. It appeared in the 2025 exam.
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