SSC
PHYSICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A light-year (ly) is a unit of distance defined as the distance light travels in one year. Numerically, 1 ly = 9 500 000 000 000 km. How many meters are in a light-year?
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9.5 × 1010 m
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9.5 × 1012 m
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9.5 × 1015 m
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9.5 × 1018 m
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Explanation:
Detailed explanation-1: -A light year is the distance that light can travel in one year. 1 light year = 9, 460, 000, 000, 000 km. One light year in scientific notation is expressed as 9.46 × 10¹² km.
Detailed explanation-2: -A light-year is a measurement of distance and not time (as the name might imply). A light-year is the distance a beam of light travels in a single Earth year, which equates to approximately 6 trillion miles (9.7 trillion kilometers).
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