Question 1067661: How many seconds will light leaving Los Angeles take to reach the following locations (a) San Francisco (about 500km), (b) London (~10,000km), (c) the Moon (400,000km), (d) Venus (0.3 A.U. from Earth at its closest approach).
Answer by Alan3354(69443)   (Show Source):
You can put this solution on YOUR website! How many seconds will light leaving Los Angeles take to reach the following locations (a) San Francisco (about 500km), (b) London (~10,000km), (c) the Moon (400,000km), (d) Venus (0.3 A.U. from Earth at its closest approach).
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The commonly used term for the speed of light is 3e5 km/sec.
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(a) San Francisco (about 500km)
d = r*t
t = d/r = 500/3e5 =~ 1.67e-3 seconds = 0.00167 seconds or 1.67 milliseconds.
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Do the others the same way.
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PS blinking your eyes takes 100 to 400 milliseconds
In 100 milliseconds light travels 30,000 km or 18,000 miles
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