It takes time 8 min for light to reach from the sun to the earth surface. If speed of light is taken to be 3 x 10 to the power 8 ms/s. Find the distance from the sun to the earth in km.
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The time taken in seconds for light to reach earth = 8 x 60 = 480 seconds.
Distance between the Sun and Earth =
distance = speed x time
= 3 x 10^8 x 48 x 10
= 1440 x 10^8 metres.
In kilometers,
1440 x 10^8 / 1000
1440 x 10^5 km.
= 144000000 km.
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