JEE Main · 2023 · 11 Apr 2023 · Shift 1 · Units & Measurement

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Given below are two statements :
Statements I : Astronomical unit (Au). Parsec (Pc) and Light year (ly) are units for measuring astronomical distances.
Statements II: Au < Parsec (Pc) < ly
In the light of the above statements. choose the most appropriate answer from the options given below:

(A)Both Statements I and Statements II are correct.
(B)Statements I is correct but Statements II is incorrect.✓ Correct
(C)Both Statements I and Statements II are incorrect.
(D)Statements I is incorrect but statements II is correct.

Answer: (B)

Solution

Astronomical unit, parsec and light year are all genuine units of astronomical distance, so the first statement is correct. Their magnitudes order as

1 AU \approx 1.5 \times 1 0^{11}

1 ly \approx 9.46 \times 1 0^{15}

m and

1 parsec \approx 3.08 \times 1 0^{16}

m, giving AU

<

<

parsec. The stated order AU

<

parsec

<

ly is therefore wrong. The first statement is correct while the second is incorrect.

JEE Main · 2023 · 11 Apr 2023 · Shift 1 · Single correct option

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JEE Main · 2023 · 11 Apr 2023 · Shift 1 · Units & Measurement

Solution

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