How long does it take light to travel from the Sun to the Earth? The Sun’s nearest neighbor among the stars, a dim little star called Proxima Centauri, is at a distance of 1.295 parsecs from us. How long does it take light to travel from Proxima Centauri to the Earth?
We know that
time = distance/Speed
Speed of light = 3*10^8 m/sec
distance between Sun and earth = 1.496*10^11 m
time = 1.496*10^11 m/(3*10^8 m/sec) = 498.67 sec
time = (498.67 sec)*(1 min/60 sec) = 8.31 min
Part B.
We know that
time = distance/Velocity
Speed of light = 3*10^8 m/sec
distance between proxima centauri and earth = 1.295 pc
Since 1 pc = 1 parsec = 3.086*10^16 m
So,
time = 1.295*3.086*10^16 m/(3*10^8 m/sec)
time = 133212333 sec
Now we know that 1 yr = 3.154*10^7 sec
So,
time = (133212333 sec)*(1 yr/(3.154*10^7 sec)) = 4.22 yr
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