Zaymiey

⚛️ Physics  ·  Units and Measurements  ·  NEET & JEE

One astronomical unit (AU), the mean Earth-Sun distance, is closest to:

Answer: 1.496 × 10 11 m.

  • A 9.46 × 10<sup>15</sup> m
  • B 1.496 × 10<sup>11</sup> m
  • C 3.084 × 10<sup>16</sup> m
  • D 1.496 × 10<sup>9</sup> m

Correct answer: B. 1.496 × 10<sup>11</sup> m

Explanation: 1 AU is about 1.496 × 10<sup>11</sup> m. In contrast, 1 light year is about 9.46 × 10<sup>15</sup> m and 1 parsec is about 3.084 × 10<sup>16</sup> m.

The 7 SI Base UnitsLengthmetre (m)fundamentalMasskilogram (kg)Timesecond (s)Electric Currentampere (A)Temperaturekelvin (K)Amount ofSubstancemole (mol)LuminousIntensitycandela (cd)Every other physical quantity is derived by combining powers of these 7 base units

The 7 SI base units. All derived units (newton, joule, watt, volt, etc.) can be expressed as combinations of these 7 fundamental units raised to various powers.

Concept context

SI base units, dimensional analysis, significant figures, and error propagation. The toolkit every physics calculation relies on.

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