What is the relation between 1 astronomical unit (AU) and one parsec (P)?

Options

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

Answer

b

Explanation

1 P is the distance at which an arc of one AU makes an angle of one second.

`because " Angle"=("Arc")/("Radius") therefore 1s=(1AU)/(1P)`