How many times will light travel around the Earth in one second?

7

times

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5

times

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3

times

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9

times

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Solution

The correct option is A $7$ times
Radius of earth = $6371 \times 10^{3} m$
perimeter of circle about centre of earth $= 2 \times 3671 \times 10^{3}$
$= 4 \times 10^{7} m$
Distance travelled by light in 1 sec $= 3 \times 10^{8}$
No. of times light can travel about earth $= \frac{3 \times 10^{8}}{4 \times 10^{7}}$
$= 7.5$ times $\Rightarrow 7$ times (A)

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