What is the value of one light year?

9.4 \times 10^{12} k m

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9.46 \times 10^{10} k m

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9.46 \times 10^{14} k m

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9.46 \times 10^{8} k m

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Solution

The correct option is A $9.4 \times 10^{12} k m$
We know speed of light is $300000 k m / s$
And One year= $365 \times 24 \times 60 \times 60 = 31536000 s$
And one light year is defined as distance travelled by light in one year.
So One Light year= $300000 k m / s \times 31536000 = 9.46 \times 10^{12} k m$

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Convert 1 light year into km

9.46 \times 10^{12} k m

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If the speed of light is equal to $3 \times 10^{8} m s^{- 1}$ , how many kilometers will make up 1 light year?

9.46 \times 10^{15} m =

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