One light year is defined as the distance travelled by light in one year. The speed of light 3×108 ms-1. The same in metre is

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3×1012 m

9.461×1015 m

3×1015 m

None of these

answer is B.

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Detailed Solution

One light year =3×108 m/s× 1 yr=3×108 m s×365×24×60×60 s=3×108 ×365×24×60×60 m=9.461×1015 m

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