Question

The dimension of light year is :

• A. $\left[L^{-1}\right]$
• B. $\left[T^{-1}\right]$
• C. $[L]$
• D. $[T]$

Answer 1

Answer: (C)

As we know that the light year is the distance which is measured in metre.
It is distance travelled by light in one year.
$=3 \times 10^{8} \times 365 \times 24 \times 60 \times 60 $
$=9.5 \times 10^{15} m$
Hence, the dimension of light year is $L$.