Question

light travels at a speed of 3 lakh kilometre per second find the distance it covers in a week

Answer 1

$Given \: speed \:of \:light (s) = 300000\:km/s$

$Times (t) = 1 \: week \\= 7 \: days \\= 7 \times 24 \:hours \\= 7 \times 24 times 60\: minutes \\= 7 \times 24 times 60\times 60 \:sec\\= 604800 \: seconds$

$Distance \: covered \:in \:a \: week (d) \\= s \times t \\= 300000 \times 604800 \\= 181440000000 \:km \\= 1.8144 \times 10^{11} \:km$

Therefore.,

$\red {Distance \: covered \:in \:a \: week}$

$\green { = 1.8144 \times 10^{11} \:km}$

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