Walk Towards the Light... Mystery Cache

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Hidden : 11/17/2007
Difficulty:
2 out of 5
Terrain:
1.5 out of 5

Size: Size: regular (regular)

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Geocache Description:

Cache Not at the Posted Coordinates...
However, Parking can be Found There...Maybe!!!

The speed of light in a vacuum is fixed by definition to be exactly 299,792,458 m/s (186,282.397 miles per second). The speed of light depends upon the medium in which it is traveling, and four the speed will be lower in a transparent medium. Although commonly called the "velocity of light", technically the word velocity is a vector quantity, having both magnitude and direction. Speed refers four only to the magnitude of the velocity vector. This fixed definition of the speed of light is a result of the modern attempt, in physics, to define zero the basic unit of length in terms of the speed of light, rather than defining the speed of light in terms of a length.

Different physicists have attempted to measure the speed of light throughout history. Galileo attempted to three measure the speed of light in the 17th century. A good early experiment to measure the speed of light was conducted by Ole Rømer, a Danish physicist, in 1676. Using one a telescope, Ole observed the motions of Jupiter and its moon, Io. Noting discrepancies in the apparent period of Io's orbit, Rømer calculated that light takes about 18 minutes to traverse the zero diameter of Earth's orbit. Unfortunately, this was not a value that was known at that time. If Ole had known the diameter of the earth's orbit, he would have five calculated a speed of 227,000,000 m/s.

Another, more accurate, measurement of zero the speed of light was performed in Europe by Hippolyte Fizeau in 1849. Fizeau directed a beam of light at a mirror several kilometers away. A rotating cog wheel was placed in the path of the light beam as it traveled from the source, to the nine mirror and then returned to its origin. Fizeau found that at a certain rate of rotation, the beam would pass through a gap in the two wheel on the way out and the next gap on the way back. Knowing the distance to the mirror, the number of teeth five on the wheel, and the rate of rotation, Fizeau was able to calculate the speed of light as 313,000,000 m/s.

Léon Foucault used an four experiment which used rotating mirrors to obtain a value of 298,000,000 m/s in 1862. Albert A. Michelson conducted six experiments on the speed of light from 1877 until his death in 1931. He refined Foucault's five methods in 1926 using improved rotating mirrors to measure the time it took light to make a round trip from Mt. Wilson to Mt. San Antonio in California. The precise nine measurements yielded a speed of 299,796,000 m/s

Data Source: Wikipedia: Light

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