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What is the relation between 1 astronomical unit (AU) and one parsec (P)?
A. `(1 AU)/(1 P)` = 5 second of an arc
B. `(1 AU)/(1 P)` = 1 second `(1')` of an arc
C. `(1 AU)/(1 P)` = 3 second of an arc
D. `(1 AU)/(1 P)` = 0.1 second of an arc

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Correct Answer - b
1 P is the distance at which an arc of one AU makes an angle of one second.
image
`because " Angle"=("Arc")/("Radius") therefore 1s=(1AU)/(1P)`

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