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my_books
Joined: 29 Jun 2006
Posts: 223
Helped: 2
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 09 Aug 2008 14:17 How to measure the velocity of light ? |
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How to measure the velocity of light ?
thanks 
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Kral
Joined: 28 Mar 2005
Posts: 1014
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| 09 Aug 2008 19:27 Re: How to measure the velocity of light ? |
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my_books,
See the following article for information on the famous Michelson-Morley experiment, as well as more modern methods of measuring the speed of light.
. http://en.wikipedia.org/wiki/Michelson-Morley_experiment
Regards,
Kral
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barrybear
Joined: 22 Nov 2001
Posts: 254
Helped: 5
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| 09 Aug 2008 22:42 Re: How to measure the velocity of light ? |
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You will need a twinbeam ossiloscope and a lazer pointer that you can modulate with a single pluse.
Input the pulse to the ossiloscope and triger off it. Then point the lazer down a corrider say 50 feet and reflect the lazerbeam back to the ossiloscope into an amplified photodiode or lazer recieving diode so you can see the delayed puse on the ossiloscope . record the distance from the timbase of the scope to calculate the speed of light.
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XNOX_Rambo
Joined: 13 Jul 2002
Posts: 430
Helped: 86
Location: Far out, man!
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| 09 Aug 2008 22:53 How to measure the velocity of light ? |
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Easy:
http://www.physics.umd.edu/icpe/newsletters/n34/marshmal.htm
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Awarapunshee
Joined: 11 Jul 2007
Posts: 338
Helped: 45
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| 10 Aug 2008 7:44 Re: How to measure the velocity of light ? |
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A fiber-optic cable is composed of two concentric layers, called the core and the cladding, as illustrated in Figure 3-1. The core and cladding have different refractive indices, with the core having a refractive index of n1, and the cladding having a refractive index of n2. The index of refraction is a way of measuring the speed of light in a material. Light travels fastest in a vacuum. The actual speed of light in a vacuum is 300,000 kilometers per second, or 186,000 miles per second.
following is the site of an related experiment:
http://www.picotech.com/experiments/speed_of_light/index.html
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Kral
Joined: 28 Mar 2005
Posts: 1014
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| 10 Aug 2008 18:03 Re: How to measure the velocity of light ? |
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my_books,
XNOX_Rambo's solution is brilliant. How often do you get an opportunity to eat your experminet when you're finished?
Regards,
Kral
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