How much time it will take for the solar radiation to reach Mars?

10 m i n

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12.6 m i n

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15 m i n

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14.8 m i n

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Solution

The correct option is D $12.6 m i n$
Distance light needs to travel = orbital radius of Mars = $2.28 \times 10^{11} m$ .
Speed of light = $3 \times 10^{8} m / s$ .
So, time taken by light = $\frac{2.28 \times 10^{11}}{3 \times 10^{8}} = 760 s = 12 m i n + 40 s = 12.67 m i n$ .

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