One light year is equal to _____.
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → \(9.46\times10^{12}\) km
A light year is a unit of distance, not of time: it is the distance light travels in one year. Light travels about \(3\times10^{5}\) km every second.
Seconds in one year \(=365\times24\times60\times60\approx3.15\times10^{7}\)
One light year \(\approx3\times10^{5}\times3.15\times10^{7}\approx9.46\times10^{12}\) km