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speed of laser

 
 
Reply Mon 21 Jan, 2008 02:21 pm
Is the speed of the laser affected by its color?
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Type: Discussion • Score: 1 • Views: 561 • Replies: 9
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contrex
 
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Reply Mon 21 Jan, 2008 02:25 pm
Did you mean the speed of the light which comes from a laser?
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mars90000000
 
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Reply Tue 22 Jan, 2008 05:16 pm
LASER = Light Amplification by STIMULATED Emission of Radiations......to have a laser, all the light waves implied have the same speed therefor, your answer would be no
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curtis73
 
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Reply Tue 22 Jan, 2008 06:03 pm
Light moves at the speed of light. hence why its called "the speed of light," not the speed of red light or the speed of green light.
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mars90000000
 
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Reply Tue 22 Jan, 2008 06:23 pm
you are confusing speed of light with its wavelenght

the speed of is always about 3 times 10 to the power 8 meters per second

the color of light is determined the amount of energy it has (its wavelenght)
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Vengoropatubus
 
  1  
Reply Wed 23 Jan, 2008 09:27 pm
Light's speed isn't constant, it's constant in a vacuum. In many situations, the speed changes depending on its frequency, or else prisms would be unable to separate light.
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hingehead
 
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Reply Wed 23 Jan, 2008 10:17 pm
But all colours in a given medium travel at the same velocity, their wavelength and frequency differentiate them.
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ebrown p
 
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Reply Wed 23 Jan, 2008 10:35 pm
hingehead wrote:
But all colours in a given medium travel at the same velocity, their wavelength and frequency differentiate them.


This is not correct. All colours in a vacuum travel at the same velocity. In most media, the different frequencies of light travel at different velocities (which is slower than the speed of light in a vacuum).

This is how a prism works, the different colors are refracted at different angles because of their different velocities.
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ebrown p
 
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Reply Wed 23 Jan, 2008 10:39 pm
To clearly answer the original question.

In a vacuum, light goes the speed of light. The frequency has no effect.

In most media, light goes slower than "the speed of light (i.e. in a vacuum)".

There are many examples of media (including ordinary glass) where the frequency does affect the speed of light.
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hingehead
 
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Reply Wed 23 Jan, 2008 11:08 pm
So Bob Shaw's slow glass (in Other Days, Other Eyes) would never work? Dang.
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