Answer #1:
To calculate the distance that light travels in water, we need velocity and time.
Velocity and time will enable us to correctly compute the distance.
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Answer #2:
The "refractive index" of water is around 4/3 (look up). This tells us that . . .
-- the speed of light in water is about 3/4 of its speed in vacuum;
-- the time it takes light to cover a distance in water is 4/3 the time it would take
in vacuum;
-- the distance light can cover in water is about 3/4 the distance it can cover
in the same length of time in vacuum.
In whatever time it takes light to travel 1.0 meter in vacuum, it can travel
only about 75 cm in water.
Speed of light in a vacuum is c = 299 792 458 m/s.
To travel the distance of d meters, it would take light t = d / c seconds.
Therefore, if d = 1 m, then:
t = 1 / 299792458 s ~= 3.3356 * 10^-9 s = 3.3356 ns
It would take light approximately 3.3356 nanoseconds to travel one meter in a vacuum.
1/299792458 of a second, by the definition of one meter.
299,792.458 kilometers (186,282.397 miles)
1 meter / 300,000,000 meters/second; approximately 3.3 nanoseconds.
Not long, just 0.00100069 seconds.
0.4137 (rounded)
3.3356
It will take light about 0.000834 seconds or 834 millionths of a second to travel 250 kilometers in vacuum, somewhat longer in any material substance.
Less than the blink of an eye; about 0.0107 second.
A lightyear is the distance that light can travel in one year.
Just divide the speed of light by the distance.
Well, it takes 2,700 years for light to travel that far. Anything travelling at half light-speed would take 5,400 years. At 1/4 light-speed, it would take 10,800 years.
It will take light about 0.000834 seconds or 834 millionths of a second to travel 250 kilometers in vacuum, somewhat longer in any material substance.
You create a vacuum in a lab, and then shine a light through it, and there is experimental proof that light travels through a vacuum. Alternatively, take the fact that light travels through space - if light could not travel through a vacuum, no light from the stars, the moon or the sun would ever reach our planet.
Less than the blink of an eye; about 0.0107 second.
It will take 1 year, as soon as you and Albert work out how to travel at the speed of light. ;)
A lightyear is the distance that light can travel in one year.
It takes light exactly one hour to travel in 1 hour.
It takes about 8 minutes.
It take the light to travel for 2 million years Actually about 100 years, maybe less.
If the light is in a vacuum then it would take around 0.00000033 seconds.
Light take approximately 8 minute 20 seconds to travel from the sun to the earth.
It depends where you live
8 minutes