One astronomical unit, or one au is defined as the: a. distance traveled by light in one year b. mean distance between the sun and the earth c. distance from which earth-sun distance will d. distance traveled by light in one second. sun distance will sublend an angle of one arcsecond

Option (B)

Explanation:

To measure the distance between two objects we use the units of length.

To measure small distances we use, mm or cm or m. But if we measure large distances between two objects we use large units such that kilometer or miles.

To measure the very large distances between two objects we use large units such as Astronomical unit or Parsec.

The Astronomical unit is defied as the distance between earth and Sun.

Thus, the distance between earth and the sun is defined as 1 Astronomical unit.

1 Astronomical unit = 1 A.U. = 1.5 x 10^8 km = 1.5 x 10^11 m

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