Question

23. Which of the following lists shows units of distance in order from shortest to longest? A) kilometer, light-year, meter; B) 10" meter, 10-meter, 10meter; C) light-minute, Astronomical Unit, light-year D) minute, year, light-year

Answer 1

Answer:

The correct option is: C) light-minute, Astronomical Unit, light-year

Explanation:

In cosmology, the distance between the objects in the universe is measured by using units such as light year, light-minute, and astronomical unit.

Here, 1 Light minute ≅ 1.8x 10¹⁰ m

1 Astronomical Unit (au) ≅ 1.49 x 10¹¹ m

1 Light year (ly) ≅ 9.46 x 10¹⁵ m

Now, arranging the units in ascending order: light-minute, Astronomical Unit, light-year.