Question

light from our frist door neighbouring satr reaches us in 4.5 years calculate its distance from earth in kilometere

Answer 1

S= 42.5736×10^12 km

Explanation:

Given

Speed of light = 3×10^8 m/s

Time taken to reach = 4.5 yrs = 14.1912 ×10^7 seconds

Distance from star to us =?

As we know

S= v×t

S = 3×10^8 × 14.1912 ×10^7

S = 42.5736×10^15 meters

Or

S= 42.5736×10^12 kilometers

Hope it helps

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