Speed of light in vacuum is $k m s^{- 1}$

3 \times 10^{8}

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3 \times 10^{5}

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3 \times 10^{6}

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3 \times 10^{7}

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Solution

The correct option is B $3 \times 10^{5}$
We know $1 k m = 1000 m$
Speed of light in vacuum is $3 \times 10^{8} m s^{- 1} = \frac{3 \times 10^{8}}{1000} = 3 \times 10^{5} k m s^{- 1}$

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