- Light also a form of energy, scattered in various directions when some action take part between molicules or atoms. Matter is a concentrated spot of energy. Therefore light can be considered as some particles for the purpose of explanation of its behaviors.
- Light propagate the same way heat or Electro magnetism is radiated.
- A spot of light emitted from a source will emit again itself in all directions in the next step, resulting diminish its intensity. Therefore light spends while it propagates. It doesn't require a medium to travel.
The role of medium can be explained this way : When an energy particle hit at one end of a molecule in the medium, this molecule absorb light in to it while the excess amount of energy that it cannot hold, transfers to the adjacent molecule.
During jet propulsion the backward emission of gasses having relatively zero velocity. So that the exhaust gas remain stationary on sky and we see it as a smoke line drawn in sky.
This phenomena further derives: that the maximum speed that a jet plane can atchive is the root mean square speed of exhaust gasses.
There is an upper limit and a lower limit of light spectrum. Above upper limit energy emission as light, will stop and it turns to a different form of energy, that cannot consider as light anymore. Like any other form of energy, light also available within a certain frequency range. Light is available within a spectrum 380 Tetra Hertz to 760 Tetra Hertz. Tetra hertz is One trillion periods per second. Therefore light spectrum is having different speeds. "Look at the Rainbow."
- We can imagine what will happen if we travel at speeds closer to speed of light, assuming how we experience Dopler effect. If we reach towards the speed of light, the color of objects we see will be turning from blue color to red color. We will see straight objects getting concaved.
We have experienced that we can change the speed of light with laborary experiments, (See Fig.2) by letting it pass though different mediums. When we change the speed of light in a laboratory experiment by passing it through a prism its velocity reduces through the glass medium. Depending the length it has to travel its' color changes from violet to red.
Like wise it is not possible to derive theories assuming the speed of light is invariant. By making a wrong assumption at this stage we may end up with alarming mathematical results. Theory of relativity based on the assumption that the speed of light is invariant to all observers.
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Last edited : On 7th October 2010 by Leelananda Jayasuriya.