Theory of relativity: the truth and the myth 2001

 By A. Shanmugam

Beitrag aus dem GOM-Projekt: 2394 weitere kritische Veröffentlichungen
zur Ergänzung der Dokumentation Textversion 1.2 – 2004, Kapitel 4. 

Theory of relativity: the truth and the myth: [datiert: 21.12.01] / A. Shanmugam.
In: The general science journal. 2001 – 5 S. = 

The principle of relativity was first stated by Newton, in one of his corollaries to the laws of motion: "The motions of bodies included in a given space are the same among themselves, whether that space is at rest or moves uniformly forward in a straight line". This means, until a person inside a moving frame looks outside, no experiment done inside the moving frame will reveal him that he is under steady motion. Since the experiments done inside a moving frame will appear the same as if they are done in a rest frame.

Newton’s principle of relativity has been right, and is still right, for matter concerned motions. Whereas the motion of waves does not obey his principle of relativity. This means, for example,

Case 1:
If a car A and car B are moving with velocities 30 km/hr and 50 km/hr in the same direction then with respective to car A, car B will be moving with a velocity of 20 km/hr.

Case 2:
If a car is moving with a velocity v, and a light also travels in the same direction with velocity ‘c’, then with respect to car the velocity of light is still ‘c’, and not c-v as the Newton’s principle would tell.

His theory fails for waves but still works for matter. There should have been two ways to tackle the situation. First, the motion of matter and the motion of waves should not have been taken on equal footing. (This is the point I would like to stress later). Second, to invent a theory which should take care of both the cases together. Scientists then resorted to the second way. In the mean time the famous Michelson – Morley experiment was performed to test if really velocity of light with respect to any other moving body remained unchanged.

The experiment failed to observe any difference in the relative velocity of light. After 18 years Einstein explained the negative results of this experiment. He almost dictated the entire world with a simple truth. As God said, "let there be light", and there was light, Einstein said, "let it travel with the velocity of ‘c’ and only ‘c’", and it did. Thus born the new theory of relativity, known as Einstein’s special theory of relativity. It says two things,

i ) The velocity of light is always ‘c’.
ii) The velocity of light is always c whether or not it comes from moving source or whether or not it is observed by moving bodies.

Since Galilean transformation did not support this new concept, a new transformation of coordinates was invented by Lorentz.

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