Question

The dimensional formula of light year is:

• A. $[L^{-1}]$
• B. $[T^{-1}]$
• 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 $L$