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Astronomical Distances and Light Years
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The distance of a galaxy from the earth is of the order of $10^{25}$ m. The time taken by light to reach the earth from the galaxy is
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A
$3 \times 10^{16}$ s
💡 Explanation:
Speed of light, c = 3 x 10$^8$ m s$^{-1}$
Time taken by light to reach the earth from the galaxy is
$\displaystyle t = \frac {10^{25}m}{3\times 10^8m,s^{-1}},=,3\times 10^{16}s$