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Units and Measurements — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysicsUnits and Measurements1 Mark
Question
Define parsec.
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Answer

The distance at which a star would have annual parallax of 1 second of arc. 1 parsec $=3.08 \times 10^{16} \mathrm{~m}$.

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