Given below are two statements: Statements 1: Astronomical unit (AU), Parsec (pc) and Light year (ly) are units for measuring astronomical distances. Statement 2: The light of the above distances, choose the most appropriate answer from the options given below:
Both Statements 1 and 2 are correct.
Both Statements 1 and 2 are incorrect.
Statement I is correct but Statement II is incorrect.
Statement I is incorrect but Statement II is correct.
Correct answer:A
Standard Method
Given: Two statements about astronomical distance units are provided.
Find: Which option correctly identifies the truth of the two statements.
The solution states that the astronomical unit (AU) is the average distance from the Earth to the Sun, the parsec (pc) is the distance at which one astronomical unit subtends an angle of one second of arc, and the light year (ly) is the distance that light travels in one year.
These are all standard units used in astronomy to measure large distances in space.
Therefore, both statements are correct and the correct option is A.
Confusing astronomical units of distance with units of time or angle. A light year is a distance, not a time interval. Always identify what physical quantity the unit measures.
Assuming parsec is not a distance unit because it is defined using angle. It is still a unit of distance derived from parallax geometry. Use the physical definition carefully.
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