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

3 \times 10^{14}

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3 \times 10^{16}

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3 \times 10^{18}

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3 \times 10^{20}

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Solution

The correct option is B $3 \times 10^{16}$ s
Speed of light, c = 3 x 10 $^{8}$ m s $^{- 1}$
Time taken by light to reach the earth from the galaxy is
$t = \frac{10^{25} m}{3 \times 10^{8} m s^{- 1}} = 3 \times 10^{16} s$

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The distance of a galaxy from the earth is of the order of 1025 m. The time taken by light to reach the earth from the galaxy is

The correct option is B 3×1016 sSpeed of light, c = 3 x 108 m s−1Time taken by light to reach the earth from the galaxy ist=1025m3×108ms−1=3×1016s

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

The correct option is B $3 \times 10^{16}$ s
Speed of light, c = 3 x 10 $^{8}$ m s $^{- 1}$
Time taken by light to reach the earth from the galaxy is
$t = \frac{10^{25} m}{3 \times 10^{8} m s^{- 1}} = 3 \times 10^{16} s$