The distance of a galaxy from the earth is 5-6 - 1025 m- Assuming the speed of light to be 3 - 108 m S-1 find the time taken by light to travel this distance-

Distance of galaxy = 5.6 × 1025 m Speed of light = 3 × 108 m/s Time taken by light = Distance travelled/speed of light = (5.6 × 1025 / 3 × 108) s = 1.87 × 101 ...

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Standard IX

Physics

Time and Speed

The distance ...

Question

The distance of a galaxy from the earth is 5.6 $\times$ 10 $^{25}$ m. Assuming the speed of light to be 3 $\times$ 10 $^{8}$ m S $^{- 1}$ find the time taken by light to travel this distance.

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Solution

Distance of galaxy = 5.6 × 10²⁵ m
Speed of light = 3 × 10⁸ m/s

Time taken by light = Distance travelled/speed of light
= (5.6 × 10²⁵/ 3 × 10⁸) s
= 1.87 × 10¹⁷ s

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The distance of a galaxy from the earth is 5.6 × 1025 m. Assuming the speed of light to be 3 × 108 m S−1 find the time taken by light to travel this distance.

Distance of galaxy = 5.6 × 1025 m Speed of light = 3 × 108 m/s Time taken by light = Distance travelled/speed of light = (5.6 × 1025 / 3 × 108) s = 1.87 × 1017 s

The distance of a galaxy from the earth is 5.6 $\times$ 10 $^{25}$ m. Assuming the speed of light to be 3 $\times$ 10 $^{8}$ m S $^{- 1}$ find the time taken by light to travel this distance.

Distance of galaxy = 5.6 × 10²⁵ m
Speed of light = 3 × 10⁸ m/s

Time taken by light = Distance travelled/speed of light
= (5.6 × 10²⁵/ 3 × 10⁸) s
= 1.87 × 10¹⁷ s