What is the theory of relativity ?Explain accoreing to the standard of class 9.?

Answer 1

E=MC2 (squared)

Answer 2

Well most answers are incorrect in the sense that they are all inferences of the theory of relativity. The theory of relativity simply put says that all observations are in relation to the state of the observer. Sounds pretty simple dosent it? The implications are not. It means that if you hold ur hand in cold water and then put it in a bucket of water at room tempreture, you will find the water hot and vice versa. If you are travelling as a certain speed, the speed at which time flows for you is different from someone who is standing still. This is shown by the equation E=Mc2.

ALthough Eienstien is accridited with the discovery, the saying "beauty lies in the eyes of the beholder" another statement that can be infered from the theory has been around for ages.

Hope this was simple enough. Keep learning

Answer 3

Everything started with the Michelson-Morley experiment to determine the absolute speed of the Earth through the theorised "luminiferous aether." The experiment was a failure but it did show something: the speed of light is independent of the speed of the observer. This means that two persons that follow the same light ray at different speeds will measure the same relative speed for the ray.

There were several articles before Einstein's trying to explain how this could happen. The most important was written by Lorentz, who postulated that light travels at a speed of c through the ether, and that when other objects move through the ether, they are compressed in the direction of motion, and their time slows down. He still had in mind absolute movement, and was thinking that a moving observer would measure the correct speed of light by a compensation of errors. According to Lorentz, if an observer's reference frame is moving along with the light, then the speed of light relative to that observer would be slower, but the contraction of the length of the instruments and the slowdown of time would be exactly enough to measure the speed of light as c.

Einstein explained the same effect in a simpler way using the relativity principle. He imagined a ray of light bouncing between two mirrors. For an observer static with the mirrors this takes a given time. For an observer moving with respect to them this takes longer (the speed of light is the same and the space is more). From here he calculated the equation for transforming time.

Later, using the previous equation, he discovered that simultaneity was not possible for all inertial systems. If we synchronize several clocks in a frame, they will look desynchronized from a frame at different speed.

Finally, he used the previous results to obtain the same equation as Lorentz had for space contraction.

After he did this, many people, including himself, tried to find any inconsistencies in the system. Many supposed inconsistencies (or paradoxes) were proposed. Einstein took the job of looking for an explanation for all of them one by one, until another scientist, named Hermann Minkowski, showed that the whole system of special relativity is self-consistent and therefore no real paradox can appear.

Answer 4

So all answers are right in a way. But the most interesting fact about the theory is (according to my humble opinion) that everything is relative. What is this then?
Well, until Einstein many scientists tried to find the absolute medium. This means a something which is absolute stable in regards of position in the universe. E.g. a medium where all electromagnetic radiation like light travel at lightspeed. Look up Michelson & Morley who executed a well documented experiment and failed to find something like that (they called it Ether or something).
Not being able to find something like that Einstein came up with this relativity thing: Every phenomenon observed is only valid for this very observer. When you measure for example the speed of a train you measure it RELATIVE to its tracks or a stationary observer. THis observer is only stationary relative to the tracks which, along with the underlying planet, move through space.
And the real trick behind this is, that the speed of the observer dramatically alters the observation. But these changes start to get really dramatic only until relativistic speeds are involved. (relativistic means close to lightspeed). To see the difference look up the Lorenz-Transformation in comparisson to the Newton-Transformation. Both describe the same phenomenon (Transformation from one inertial (=stationary) system to another which are moving relative (again this relative) to each other. Only Lorenz (or was it Lorentz) included a factor to come up with this lightspeed theorem which is neglectible as long as relative slow speeds (= much much lower than lightspeed) are invoved)
Try it out. In theory you can calculate how fast you have to run to be just in time when starting an hour late.

Answer 5

The relativity theory is invented by Albert Einstein. Basicly, Relativity is theory about the speed of particle that close to the speed of light in universe (c = 300000000 m/s). There are two main concept about the relativity theory which is known as special relativity postulat:

1. All the physical law is equate for all reference of inersia frame
2. The momentum of light in empty space is same, about 300000000 m/s for all reference of inersia frame.

note:" Every movement in this world is relative to each people who pay attention to."

To ask more about the relativity theory, feel free to email me at [e-mail].

Kind regards,


Purnomo

Answer 6

well according to the standard of class 9 the theory of relativity is a special kind of theory proposed by Albert Einstein which relates mass of a body with the energy possessed by it. it says that if a body is moving with a speed that is comparable to that of light which is roughly 300000000metre per second then a relation exists between its energy and mass. this relation can also be used to find out how much energy will be released when the fusion reaction takes place.

Answer 7

Theory of relativity is a world famous theory proposed by Albert einstein . It gives the relation between mass and energy and hence is also called as Mass energy eqivalence.
it is denoted by E=M * (c){square}
i.e product of mass and square of velocity of light .
It means that a given (M) mass of substance is destroyed then that much amount of energy(E) is released . this energy is utilized for keeping the constituents of the nuclues and atom intact.
now what happens to the mass is what even i dont know so this is what i know. it is good that 9 class student like you is takin interest in core subject of physics .
keep it up!

Answer 8

Einstein proved: The time is not absolute (same for all observers who are moving with very high speeds). He concluded that the maximum speed a material particle in this world can acquire is C (speed of light) and not unlimited. Even C can not be reached because even if we reach that we can not have instruments to measure it - mass of instruments will become = 0 due to V=C

But, Newton treated time (T) as absolute in his laws of motion. Thus for him all observers will report same Delta T between 2 events - this means their source of observation (eyes) will receive the emitted signals from events instantaneously - howsoever farther observers may be placed relatively. This means signal travelled with INFINITE speed >> or

Delta Time = distance / infinity = 0

So speed of object can be V < C, thus all observers will have different Delta Time - time is relative

Similarly, Einstein proved mass varies with speed, and then derived E = m * c^2

* Einstien said to Newton: You were the most critical brain of that era. Please forgive me for modifying your laws. If the speed exceeds a limit - my laws will be applicable.

Answer 9

this theory proposed by Dr. Einstein deals with effects of speed on matter i.e what happens to matter when it moves say at speeds close to that of light(300,000km per sec!!!)
the effects are different from real life experinces
1)Length Contraction: moving objects appear shorter!!
2)Time dialation:for moving objects time moves slower
3) mass variation: moving objects weigh more
by moving i mean moving fast
this was the special relativity -earlier it was thought that time was absolute-it was proved here that time is relative
the theory of general relativity deals with the effect of gravitation too.

Answer 10

The theory of relativity is the theory of Space and Time and Gravity. It is the theory of spatial and temporal relativity from the point of view of the observer and the curvature of Space Time due to a gravitational body.

Answer 11

E = mC2 (energy released= mass of the substance converted into energy multiplied by square of the velocity of the light). This was proposed by Einstein. This was the theory behind atom bomb delivered at Hiroshima and Nagasaki.