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Old 28-08-2005, 10:42 AM
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acropolite (Phil)
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Join Date: Feb 2005
Location: Launceston Tasmania
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The photons energy, speed and direction are an integral part of its generation. Nothing has been applied to it to get it moving on its way.
The photon's energy speed and direction are the result of it's generation just as the energy, speed and direction of the marble are the result of its launch. I haven't done any physics for 30+ years but I seem to remember that the photon is ejected as a result of electrons moving from one energy state to another within a molecule. It is incorrect to say that nothing has been applied to get the photon moving on it's way; for example in the case of lasers, energy has been applied, just as energy was applied to the marble. In a star, chemical reactions (producing energy) are causing the photons to be ejected. Pressure is exerted by photons and can be measured, and varies accordingly if the light is reflected. How can this occur if light has no mass. http://en.wikipedia.org/wiki/Radiation_pressure
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