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Q.

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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a

3×1015  m

b

3×1012  m

c

9.461×1015  m

d

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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