Question

Name any two units of length which are bigger than the metre. Write the relation between each of those units and the metre.

Answer 1

Hint: Remind the units of length which are bigger than the SI unit of length which is metre. To check whether the unit is bigger than metre, check whether one unit of that particular unit is equal to more than one metre.

Complete step by step answer:
In the SI system, the unit of the length is metre.
There are several units of length like millimeter, centimeter, metre, kilometer, hectometre, mile, astronomical unit, light-year, etc.
Consider two units bigger than metre are light-year and astronomical units.
The unit of the length light-year is bigger than metre and is used to measure the astronomical distances.
According to the International Astronomical Union, one light-year is the distance travelled by the light in vacuum in one Julian year.
The unit light-year is denoted as ly.
One light-year is equal to the length \[9.4607 \times {10^{15}}{\text{ m}}\].
\[1\,{\text{ly}} = 9.4607 \times {10^{15}}{\text{ m}}\]
The astronomical unit is one of the units of the length bigger than metre. One astronomical unit is the distance between the Earth and the Sun.
It is denoted as AU.
The unit of length astronomical unit makes the measurement of the bigger astronomical lengths easy as one can compare the astronomical distances with the distance between the Earth and the Sun.
One astronomical unit is equal to \[1.496 \times {10^{11}}{\text{ m}}\].
\[1\,{\text{AU}} = 1.496 \times {10^{11}}{\text{ m}}\]

Note:
One can misunderstand that light-year is the unit of time as it includes the word year. But it is the distance covered by the light in vacuum in one Julian year. Hence, light-year is the unit of length and not time.