Thursday, 1 November 2012
Time, this word can sound to you very frequent but actually it is not. Maybe no one ever has tried to think about it or maybe that’s what i think. Time is keep passing and keeps on but where does it go? What is it? According to science time is a 4th dimension where some events or things are ordered from past to present and the interval in b/w such events occur is called ‘time’. So actually here i am talking about space and time not the physical one which can be measured through devices. According to Einstein’s ’theory of relativity’ rules of physics are always equal to the observer! Einstein’s famous equation ‘E= MC ^2’ has always been very interesting to me because it sounds cool to me and kind of interesting. It states something like mass of body is equivalent to its own energy where ‘e’ stands for energy, ‘m’ for mass and ‘c’ is used for speed of light. Alright now let’s talk about ‘time dilation’. In the theory of relativity time dilation is the disparity b/w two actions either moving towards each other or situated from gravitation masses. An accurate at rest with respect to one observer maybe measured to tick at the different rate when compared to second observer’s own equally accurate clocks. In 1905, Einstein explained that this was simply the way that light behaved and that it only seemed strange because our common sense notions of how relative speeds were supposed to add up were only true for very slow moving objects (as compared to the speed of light). So the speed of light is unaffected by the speed of its source. Let's see what falls out of this...imagine having two horizontal mirrors facing each other and that one mirror is spaced above the other by the distance d. Also imagine that there is a pulse of light that bounces vertically between the two mirrors as shown in the left part of the drawing below. The time it takes for the pulse of light to do a round trip (from the top mirror to the bottom mirror and back to the top) is twice the distance d divided by the speed of light. This device would actually make a great clock since the pulse can be relied on to always travel at the same speed while doing its round trips and thus always counting out consistent time intervals.