One light year is the distance light travels in one year. What is that distance in kilometres?
A9.46 x 10^9 km
B5.88 x 10^12 km
C9.46 x 10^12 km
D9.46 x 10^15 km
Answer & Solution
Correct answer: C. 9.46 x 10^12 km
1. One light year is defined as the distance light travels in one year.
2. That distance is given as 9.46 x 10^12 kilometres, or equivalently 5.88 x 10^12 miles.
3. 5.88 x 10^12 km is the mile figure mistakenly carried over as kilometres, so that option mixes up the two units.
4. 9.46 x 10^9 km and 9.46 x 10^15 km are both off by three orders of magnitude from the stated value.
_Source: OpenStax Physics (CC BY 4.0), Ch 15 "Light", section 15.2 The Behavior of Electromagnetic Radiation_
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