Question

The dimension of light year is:

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

Answer 1

Answer: (C)

$\left[ L\right]$

Answer 2

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 $L$