Physics, asked by palakthakur6097, 1 year ago

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?

Answers

Answered by RajivShastry
2

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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