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One parsec in astronomical units (A.U.) is about

Options

  1. A2 10^3 A.U.
  2. B2 10^4 A.U.
  3. C2 10^5 A.U.
  4. D2 10^6 A.U.

Correct answer

C. 2 10^5 A.U.

Step-by-step solution

One parsec is defined as the distance at which an arc of length one astronomical unit (A.U.) subtends an angle of one second of arc. = 1'' = ( 1 3600 )^ = 180 3600 rad r = l = 1 A.U. 180 3600 r = 180 3600 A.U. 206265 A.U. r 2 10^5 A.U. Answer: 2 10^5 A.U.

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