Q. One light year is defined as the distance travelled by light in one year. The speed of light is $3 \times 10^{8}ms^{- 1}$. The same in metre is
A) $3 \times 10^{12}$m
B) $9.461 \times 10^{15}$m
C) $3 \times 10^{15}$m
D) None of these
Explanation
One light year $= 3 \times 10^{8}$ m/s year $= \frac{3 \times 10^{8}}{s} \times 365 \times 24 \times 60 \times 60$s $= 3 \times 10^{8}\ \times 365 \times 24 \times 60 \times 60$m $= 9.461 \times 10^{15}$m
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.