SOLUTION: Use the speed of light as c = 3 � 10^8 m/s when needed. The nearest star to the Sun is Proxima Centauri, at a distance of 4.5 light years. How many seconds does it take light fr

Question 944273: Use the speed of light as c = 3 � 10^8 m/s when needed.
The nearest star to the Sun is Proxima Centauri, at a distance of 4.5 light years. How many seconds does it take light from our Sun to reach Proxima Centauri?
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
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1 light-year = distance traveled by light in one year:
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light from the Sun reaches Proxima Centauri in 4.5 years
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number of seconds per year:
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T = 1 year * (365 days/year) * (24 hr/day) * (60*60 sec/hr)
T = 1 * (365) * (24) * (60*60)
T = 31536000 sec/year
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t = (4.5 light-years) * 31536000 sec/year
t = (4.5) * 31536000
t = 1.41912 * 10^8 seconds
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light from the Sun reaches Proxima Centauri in 1.41912 * 10^8 seconds
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