Twin Paradox: can someone explain me??

Question

One stays on earth, one goes on a journey at the speed of light for 2 years.
When he comes back, several years have passed away....???
Please explain with details....

Answer 1

In special relativity (and in reality), if something is moving relative to you, the time for that thing will be percieved by you to be slowed down. So, if a rocket goes past you at half the speed of light, the clocks (and other processes) on that rocket will be seen by you as going about 87% as fast as you own.

But, in special reltivity, there is no absolute reference frame: that rocket going past you at half the speed of light sees *you* as going past it at half the speed of light in the other direction! So someone on that rocket sees your clocks as going at 87% as fast as theirs. Already you can see part of the paradox. How can both observers see the other clock as going slower?

This is made more specific by having two twins: A and B. Put twin A into a rocket going at, say 99% of the speed of light. Have that twin go to a star that is, say 20 light years away and return.

From B's persepctive, the journey takes a bit over 40 years total (20 out and 20 back). But by A's clock (and experience) the journey only took about five and a half years. Why the difference? According to A, twin B is going at 99% of the speed of light and A should think that B's clock would be going slower. Why is it that B is the older one when they get back together and not A?

The resolution stems from the fact that twin A and twin B do not have exactly the same experiences. In fact, when twin A turns around, there is an acceleration which twin A experiences as a force that twin B never experiences. This difference is enough to make it so that twin A actually does age less than twin B.

Answer 2

Both twins see the distance between the two increase and decrease. Speeds are relative. From either twin's perspective, the clock with the other twin should run slower. So, the result would be that both clocks would eventually show the same time. But this is not the case, and that's the paradox.

The difference in time is not due to the speed of the twin. It occurs because of the acceleration (deceleration is also an acceleration, just a negative one).

See this for a full explanation: http://en.wikipedia.org/wiki/Twin_paradox

Answer 3

The first hurdle you must get over is the idea of universal time. IT doesn't exist. Every individual observer keeps thier own time and it's accurate for them. When you start traveling at very high speeds in realtion to something else, speeds approaching the speed of light, a difference starts to emerge in how each person experiences the passage of time. To each individual they notice no difference. To the person going very very fast, everything seems normal. However if they could look at eachothers clocks, each one would argue that the others clock was moving either faster or slower than it should be.

think of it this way.. when you look at a clock, you are seeing the light that is hitting the clock and bouncing back towards you.. What if you started traveling away from the clock at very close to the speed of light? the clock would appear to be almost standing still. If you looked at your own watch it would look normal.

It's a strange concept and honestly I do not understand why it happens but it has been proven experimentally.

Answer 4

The simplest way to summarize the Twin Paradox is that of all clocks with different spacetime paths, it's the one that is at rest that has the "fastest clock". There is an alternate way of graphing spacetime paths (not Minkowskian), such that along its length proper time is a constant. If I have any number of paths of a given length, or proper time, it's the one that goes straight, or is at rest, that goes furthest in observed time, while any other curved or crooked path won't reach out as far. This is very easy to visualize geometrically.

Addendum: It's not possible in Special Relativity to do a transformation on a curved spacetime path so that it appears at rest relative to everything else, which is part of the reason why General Relativity was developed.

Answer 5

In twins paradox in effortless words one deliver may take off yet considering that both be conscious the different vacationing away (because the deliver looks extremely table sure to the guy on it and they are observing it as in spite of the undeniable fact that each and everything else develop into transferring away) the different twin may have recognized to age more beneficial immediately (or themselves age more beneficial slowly, both way) depending on the conception that spacial relativity has an impression on that. That assumption is depending off an try carried out with clocks and airplanes the international over with version by means of earth's rotation accounted for. What they did not account for in spite of the undeniable fact that is unknown rotation. that is theoretically in all likelihood that entire galaxies have rotations round one yet another that weren't accounted for in spite of the undeniable fact that, that could clarify the version making this finished idea try unnecessary. besides, assuming the spacial relativity age vast difference element isn't finished BS it could be defined by technique of the undeniable truth that one is bodily transferring and fewer than further actual forces of flow, acceleration, deceleration, and so on that the different isn't therefore no longer making it a real paradox and in effortless words one observing different as having elderly more beneficial immediately. Given equivalent flow in opposite instructions thoroughly defeats the point of the idea try.

Answer 6

no one can travel at any time with the speed of light . even the Gods can not do it . because the speed of any traelling object is limited by the increase in its mass as it travels . If light is the fastest to travel it is because the phtotons ar the lightest particles . nd their lightest mass sets a limit at the speed of 18000 miles per second . If the mass of the particle exceeds this the speed would b reduced . So no one can go on a journey at the speed of light at any time,.there is no paradox in it . If something impossible is imagined , one can imagine some thing equally impossible or unrealistic as the result so in the impossible situation stated we can also say some impossible result . when some one who travelled at the speed of light for two years returns , he would return after another two years ( because he takes two years to travel a distance at the speed ot light itself ) , he would find people older by four years as the people have not been travelling but remaining in thier places for the duration of the journey of the man who travelled at the speed of light . His speed does not do anything to the people who are not travelling with him. He would also be older by four years .But he would not be in his shape but would have been torn into pieces equal to the mass of photons as he has travelled at the speed of light .If he were torn to pieces weighing less than the photons , he could have travelled at a speed higher than that of light too.

Answer 7

Just re-watch "Back to the Future, part 1" and listen to Doc Smith's explanation. He uses watches instead of twins, but the principle is the same, assuming the DeLorean moves through time at the speed of light. Which it would have to if the flux capacitor is operating correctly.

Answer 8

When traveling at or near the speed of light (186,214 Miles Per Second) time slows down or stops. If you travel at the speed of light for two years (2 lightyears) you must do some math 186,214 mps x 60 seconds (one minute) x 60 minutes (one hour) x 24 hours (one day) x 365 days (one earth year) x 2 all of this equals = 117,448,894,080,00 (distance traveled) Time passed in space (negligble) Time passed on Earth 2 years.

Answer 9

When one is traveling at speeds near light speed (C), times slows down for him. So when he comes back, his twin is older.

http://en.wikipedia.org/wiki/Twin_paradox.

It this simple. When you put an atomic clock on a commercial plane, it slows down very slightly in relation to a similar one on the ground. So it is "younger" upon it's return than the one that stayed.

Answer 10

Two people, twins - Mary and Marvin, are twenty years of age when Marvin heads toward a star 10 light years away where it is rumored there is a planet composed of gold and platinum, and a person is able to scoop up all they want. Marvin heads out in a spaceship he designed that could just match the speed of light and yet not convert into radiation. Believing that all would go according to plan, he took a large cup of hot coffee and six donuts, and started off.

According to plan, his craft immediately accelerated to the speed he wanted and for 10 years time, according to Mary's clock and calendar, he was speeding through space toward the star and planet he sought. At the end of those 10 years his craft immediately stopped right in front of the gold and platinum plant and he lowered his spacecraft to its surface within 10 minutes. Marvin then took 10 minutes to eat one of his donuts and drink some of his hot coffee that was still as hot as when he left earth 10 years earlier. It took him 40 minutes to load his craft by means of automated loading machinery, and then started back to earth.

Instantly his craft, once again, accelerated to the speed of light. Then, with no physical time having lapsed to him, he arrived back to earth and hurried to meet his sister Mary who was waiting just outside his spaceship. Mary had aged 20 years and one hour, and she showed it. Marvin, having aged but one hour, and shocked at seeing Mary having aged so, picked up the yet warm cup of coffee, and finished it off with a big gulp in order to steady his nerves. How did this come about?

The reason time change is able to occur is that mass is composed of electromagnetic energy. Mass is regulated according to the same laws as electromagnetic energy. This condition brings about the twin paradox. As a mass accelerates its overall frequency changes according to E = hf - the same as electromagnetic energy. Mass frequency increase in a particular direction is what causes a mass to move. There is a time increase (speed) according to the E value (in form of frequency) in a particular direction.

Were Marvin to have desired to test his outboard lights before he began his trip, the energy travel (electrons) had the potential of moving at the speed of 186,000 mps (miles per second). Once he began his trip that right angle value would decrease according to his speed. Once at the speed of light, minus 2 mps, energy could move most at 2 mps instead of the 186,000 mps when the mass was at rest. At the speed of light, all energy would have the potential of zero movement at right angles to direction of travel and so time (physical time requeires three dimensional mass in order for it to form) would cease to exist. The following would be true m = 0, e = hf, c = h.

http://timebones.blogspot.com
http://360.yahoo.com/noddarc may be of interest.