# 1 AU is equal to (a) 1.5 x 1011 (b) 1.5 x 1010 (c) 1.5 x 109 (d) 1.5 x 10-11

One astronomical unit is defined as the distance between the sun and the earth.

1 AU = 1.5×10 11 m

Hence, the correct answer is option (a)