A star is 10 light years away from the earth .Suppose it brightens up suddenly today.After how much time shall we see this change?
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1 light year = 9.46 X 10¹⁵ m
10 light years = 94.6 X 10¹⁵ m
Speed = distance/time
Speed of light = 3 X 10⁸ m/s
3 X 10⁸ = 94.6 X 10¹⁵/time
t = 31.53 X 10⁷ seconds
t = 52.55 X 10⁵ minutes
t = 87.58 X 10³ hours
t = 3.64916 X 10³ days
t = 9.99 years = 10 years
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