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TULASI-PRÄJÑA, Sept., 1990
moves, there occurs a contraction in the space-and-time-dimensions. This means that the length of the moving body contracts in the direction of the motion and a clock placed in such a system moves slowly. The amount of these contractions depends upon the velocity of the system. The faster the system moves, the slower the clock becomes and the smaller the measuring rod becomes. And if we imagine that the speed of the moving system becomes equal to that of light, the clock placed in the system would stop and the measuring rod placed in the system would have no length at all! But actually this is impossible, and hence, it is implied that the velocity of light cannot be reached in practice.
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2. Like space-and-time-dimensions, mass of a body in motion is also affected by the motion. In classical physics, the mass of a body was regarded to remain constant. That is to say that if a body is at rest or in motion, its mass always remains the same But the theory of relativity shows that the mass of a body is a function of its velocity," and thus increases with the increase in the speed of the body. When the velocity of the body is negligible in comparison to that of light, the increase in the mass of the body is also negligible. But when the velocity of the body approaches the velocity of light, the increase in mass also becomes considerable; and if we imagine a body moving with the velocity of light, its mass would become 'infinite'. But this is impossible, and therefore, it follows that the velocity of any moving body cannot become equal or greater than that of light.
3. In classical physics, matter and energy were regarded to be independent of each other, and hence there were two independent laws of conservation-one the law of conservation of matter and the other that of conservation of energy Matter was considered to be inactive, visible and possessing mass, while energy, in contrast to matter, was conceived to be active, invisible and massless.
Now, Einstein, as a consequence of the theory of relativity, showed that mass and energy were essentially the same thing. He argued that the increase in the mass of a body with the increase in its speed indicated that there should be a direct relation between mass and energy (one of whose forms is motion).
Advancing on this line of argument, Einstein established the 'principle of equivalence of mass and energy', and with the help of mathematics, discovered the epoch-making 'mass-energy equation'.
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