Question

The speed of light is 3 x 10⁸ metres per second. The distance to Alpha Centauri, the star closest to our solar system, is 4 x 10¹⁶ metres.​
Calculate the time in years, that light from Alpha Centauri takes to reach us, giving your answer to 2 significant figures.​

Answer 1

Answer:

TIME = DISTANCE/SPEED

=(4 X 10¹⁶) / (3 X 10⁸)

= ( 4 X 10⁸) / 3

= 1.333 X 10 ⁸ SECONDS

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Answer 2

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