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Light Year

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Question

Calculate the number of light years in a petametre. (where 1 peta = $10^{15} m$ )

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Solution

$1 L i g h t y e a r = 9.46 \times 10^{15} m$
$1 p e t a m e t e r = 10^{15} m$

$∴$ Number of light year in a petameter
$= \frac{10^{15}}{9.46 \times 10^{15}} = \frac{1}{9.46} = 0.1$

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