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MIT OCW Physics 20 Online
OpenStudy (anonymous):

Prove that photons are the reason for gravity... If you can't prove.. I can prove... Argue with me...

OpenStudy (anonymous):

Sorry, photons are not the source of gravity, and there's no evidence that exists that suggests as much.

OpenStudy (anonymous):

photons are not the source of gravity.......gravitons are the particles which are thought to be the reason behind the gravitational force acting between two objects having mass.

OpenStudy (anonymous):

To add to what @Rohitkhanna said, there is no known photon-particle interaction that would produce a graviton. Worse yet, given the uncertainties about the graviton and the problems that it can cause in various theories, it's a little early to claim that their created by photons. For the same reasons about gravity in general, there is no reason whatsoever to believe that photons in any way have a causal relationship with the emergence of gravity.

OpenStudy (anonymous):

well, glad you replied.. but u have heard about the experiment, not famous but quiet interesting... that.. two people spin a copper or some other sort of metal which can induce emf by variations in magnetic forces... the same principle of Induced emf in motors/generratores.. when they spinned a part of that circular coil like a swinging rope in which an galvanometer is conected. . what they observed is when they spinn, the earths gravitaional feild is acting as our house hold magnetic feild creating induced emf in to the coil recorded by that meter... what we can know about it is as gravitaional feild is nothing but magnetic feild.. Ofcourse u can say that a 3 year old kid can say that our earth is an giant magnet.. but in other thoughts.. earths gravitaional feild have the same properties of magnetic feild... and u may also aware of Mr.photon.. he travels a long distance with great speed .. and interestingly it is dual natured particle... so it do have mass.. and charge. then how come a mass have dual nature?? does the mass itself travels in a ding dong way.. no... the mass will only travel through a straight line... but the ding dong is caused by both electrical an magnetic feild by a photon.. Yes, actually photon is an charged particle (neutrally) so though having a magnetic feild.. and this make much scence.... Yet to Come... wait for it...

OpenStudy (anonymous):

You're talking nonsense. A gravitational field is not a magnetic field. Feel free to continue, but your argument has already failed. Note that no experiments to date have shown that a photon has mass. In theory it has no mass.

OpenStudy (anonymous):

teresting experiment. If you think that magnetic field is gravitational field, then why does Venus have gravity but not any magnetic field? In that experiment, how do you know that the earth's magnetic field didn't induce the EMF.?

OpenStudy (anonymous):

your argument is pointless.....

OpenStudy (anonymous):

see children, that the problem... you are not able to think out of box... even if you try just give it a hunch.. just get out of all the science stuff that we have read.. instead... think.. why it would be.... from the beginning, we read that newton discovered gravity by some accidental though... but he is the one who told us it is gravity, and we read it and believe it just because some bunch of science scientists of 21st century still use.. it.. again go back to newton age.. and rethink the whole thing instead remembering what u read... u will find a weird but new answer like mine... but still interesting.. now a days people are divided into thinkers and doers.. and please don be the second... just imagine by taking every postulate done by every scientist is false.. and we will finally end with chaos.. When u done that, its will be big bang in your mind... now it is time to redraw again in your brain by using your own brain.... after u all done by getting a conclusion on basic things.. re think again.. making your own postulate false.. which i call negative thinking... and trust me it is good... Be optimistic Bro's... they aren't the only one who can think....

OpenStudy (anonymous):

Call me Crazy, but my question is still open.... I may be wrong but i am not going down until i get a strong point in my face.... Argue with me...

OpenStudy (anonymous):

you may aware of helmholtzs coil experiment... old but still gold.. he did cancelled (partially ) earths gravitational feild by adjusting magnetic feild of two electric induced coils..... making a small portion of almost no gravitaional force space between those coils... just go through with it... and make some idea...

OpenStudy (anonymous):

The issue lies in the fact that our understanding of universal gravitation has been verified time and time again through experimental data. We are not simply taking the word of "some 21st century scientists", we accept it because many, many people have observed and gathered similar data. It is good to question what you are told, and rethink things for yourself. That being said, we have not found any significant relationship through experiment between magnetic fields and gravitational fields. The information for you to come to that conclusion yourself is there, you just need to do the work to understand it. Do keep questioning what people tell you, just be aware of what it is you are questioning.

OpenStudy (anonymous):

Nice thinking but i am not able to find any logic behind your argument.Lets get to classics you know that newton proved his theory by two masses which are separated by distance 'r' and gave the equation F= \[\frac{ Gxmxm' }{ r ^{2} }\] if your theory is right then tell us how photons help two macroscopic bodies like earth and moon attracted towards each other? How does two particle separated by a finite distance will be able to attract each other with the help of photons? And what about outer-space,there are too many photons in outer-space then why there is zero gravity over there?

OpenStudy (anonymous):

"photons are the reason for gravitational force" .... how.. lets forget photons... think about gravitational force... how is it happening... surveyed lot of videos... checked some more publications.. what you got.. "gravity is caused by some crust or molten metal movements under the earth... " doesn't seems to be fair enough to digest.. what i think??? we know that if a current carrying copper coil creates magnetic feild and in the same fluctuating magnetic feild interacts with the same coil creating minute levels of induced electric feilds... Think about whats happening in an atom... charged particles circling around ironically charged particles... what we get.. !!! attraction between atoms. between molecules.. between ... masses...

OpenStudy (anonymous):

Qustion::1:: then why the hell masses aren't repelling each other... --> imagine two bar magnets... equal masses, equal strengths.. now, take one of them and powder it.. into very small tiny micro metal particles... still every tiny particle of that powdered magnet acts as an own magnet showing poles and fields,,.. Now, take those powdered particles and arrange it into the same bar shape... 1. check the magnetic strength of both magnets... what you think you will notice?? 2. and take another new bar magnet and put it near to the first un powdered bar magnet... will can see attraction and repulsion actions... Now put the bar magnet near to out powdered bar magnet. what can probably happens.... no matter what how many angles or how many sides you try .. it will try to attract... but not get repelled.... so , whats happening here... the powdered magnets are rearranging themselves in more compatible way... here, we are talking about atoms, not even micro powdered particles ... so, every atom itself exhibits magnetic properties... I know its hard to digest for you guys.. but still think "why can't be"... so, what are role of photons..?? Yet to come...

OpenStudy (anonymous):

gravitational field is not a particle/...it is just a field. a type of field what we experience with a magnet. Role of Photons?? Just to get in to it.. we have to consider some statements into account,,, 1. Photon has mass... (i am also not sure.. but just to make some idea we have believe on something) 2. it is dual natured particle... 3. it cannot penetrate through any medium. even glass mediums... 4. its speed doesn't changes through out the reference... (copy-coned) so, consider a room which prevents photon "passing" . and weighted myself inside the room and outside the room... result the same... but when a photon hits the electron in an atom it changes its direction with low wavelength making the electron to be in its own exited state level and continuing it magnetic field... thats is the reason why we have radiations.. that is why i still weigh the same even in the room//// its not the photon that creates gravitaional field but causes for its creation... every material creates its own radiation,,, The materials that we think they are blocking radiation are themselves creating radiation but with low tendency's... No matter we allow light/photon in tho the chamber or not, the material will create its own magnetic field, but just because of photons...

OpenStudy (anonymous):

let me tell you an experiment... we all know that no matter can exist as it is all the time..in some how some manner it has to destroy or decompose itself into its parental form.. ENERGY.. Lets take two molecules of any element... place one quiet exposed to sun light.. and place another so far to our own entire universe where you will never find a photon travelling towards it.. what you think can notice... ??? Does, there will be any change in the life span of those two molecules...??? If so, Why??? I not so, why not??? since your changing some thing in those two molecules life.. some thing should happen... You can even state that, the molecule exposed to sun will die soon than the other one... If your answer is So as said abve... then how come???

OpenStudy (anonymous):

keep up the research, i have interest

OpenStudy (anonymous):

firstly you have not answered my questions!! dude i think your basics are not that strong, according to the Einstein's general theory of relativity, rest mass of photon is considered . it means that at a speed of 3x10^8 m/s there is no mass of photon under consideration. now if you take a balloon full of photons which are in motion and weight it and then let us assume that you stop the motion of those photons and the weight that balloon you will find that the balloon will become quite heavier than before. it means that it is the rest mass of the photon which exist and there is no mass of photon under consideration while in motion.

OpenStudy (anonymous):

though, now you are talking about relativity... which even didn't get through quantum mechanics... yes, it failed QM in mathematical way... so, please don't talk about Relativity, Black holes, Worm holes, bend in space and time and also don't make time as one of the physical dimension for god sake... if as my theory doesn't involve or concludes relativity , then how come you came to ask that photon is mass less based on same theory... its hopeless... since we have a bunch of assumptions made by the theory saying, black holes with enormous gravity/mass, worm holes a shortcut in space bending time. Explain these to me before you consider "Relativity" into account... Thank You...

OpenStudy (anonymous):

if I cant do that then tell me that how can you mix electromagnetism with gravitation? look gravitation is primary binder of universe, and photons are just a part of an electromagnetic radiations , if your discussion is true then lets take a real life example, if you will stand below a light bulb of a size of your height which is emitting photons every seconds then you should get attracted to that bulb due to gravity which is never gonna happen. gravity will depend only on two attracting masses, distance, and their relative densities

OpenStudy (anonymous):

bro.. agreed ... now explain me, what is this your "gravity" you are talking about between two masses and densities stuff and how it is produced.... Excited to know...@yuvraj77

OpenStudy (anonymous):

@harishk how it is produced? Simply take one mass and place it thus it would produce gravitational field g and any particle would be affected by that field if it is place through it. Secondly photon is the source of gravity is like saying when it is dark there's no gravity!!

OpenStudy (nincompoop):

if photons are the source of gravity, then just think how different electromagnetic waves interact.

OpenStudy (anonymous):

Guys, please forget about photon... Explain how G is produced from matter.... @nincompoop ; @Catch.me ; @yuvraj77 ; @chairmanMeow ; @PsiSquared ; @Rohitkhanna

OpenStudy (anonymous):

It is produced because it has energy thus gravity.

OpenStudy (anonymous):

Newton refused to hypothesise on the 'cause' of gravity, contenting himself with providing a rather excellent description of its effects. Newton's approach was eventually surpassed by Einstein's general theory of relativity. This theory can be summed up in the following way - Matter tells spacetime how to bend, spacetime tells matter how to move. Source - Taylor and Wheeler, Spacetime Physics.

OpenStudy (anonymous):

you gotta be kidding me....

OpenStudy (anonymous):

Finally, it doesn't matter whether we like a theory or not, or find it aesthetically pleasing or whatever, the sole test is agreement with experiment. Our existing theories, general relativity and quantum electrodynamics, pass the test of agreement with experiment - to an astounding degree of accuracy.

OpenStudy (anonymous):

see. quantum described that energy travels in discontinous form and the photons are the energy packets that constituent the are discrete objects that travel in the form of energy. whereas gravitational force is due to interaction of masses.now photons have mass but they cannot be considered as the cause of mass

OpenStudy (anonymous):

seriously genius.. i didn't said that photon is the cause of mass... just explain how attraction between mass is happening.. @everyone

OpenStudy (nincompoop):

@kainui @abb0t

OpenStudy (abb0t):

How about you prove to me that you can spell correctly and use proper grammar first. Deal?

OpenStudy (nincompoop):

laughing out loud

OpenStudy (anonymous):

Out of Group... Thanks Guys...

OpenStudy (kainui):

If gravity and magnetism are the same thing, then if I put a paperclip on a magnet and hold it upside down, the paperclip doesn't fall. This means the magnet is stronger than the earth. But if the magnet is stronger than the earth, how come my hand isn't attracted to the magnet but I am still attracted to the earth stronger than the magnet? It would seem to be that both the paperclip and me are both attracted to the ground or both attracted to the magnet, but you can see it goes separate ways. Why? Because they're separate forces.

OpenStudy (dan815):

ill turn of the lights and punch you

OpenStudy (dan815):

off

OpenStudy (kainui):

Don't dan, without the lights we'll go flying into outer space! We need their gravity!

OpenStudy (dan815):

lets see u prove it to me after I K.O you

OpenStudy (dan815):

lolol

OpenStudy (kainui):

That's why cavemen invented fire, so at night time they wouldn't fly away into space.

OpenStudy (dan815):

lets ee hmm

OpenStudy (dan815):

if photons are the source of gravity then exciting a mass, wud increase its gravity? as the electrons will be more excited and producing more photos?

OpenStudy (dan815):

oh im sorry hari i didnt know u were having a huge war over here!

OpenStudy (dan815):

i might have been a little insensitive there, I hope you dont take it seriously

OpenStudy (anonymous):

I am still waiting for the answer for my earlier question .... How this attraction between masses is happening...???

OpenStudy (anonymous):

Guys with 99 score... please don't waste "YOUR" time with those type of answers.. i notice that some people do this just for score or medal/fans.. (no offence to others) If u want the same, u can ask directly i wont mind... And Btw.. i am a chemical graduate and doing as a Technical adviser in a food industry from past 2 years... i went to lot of places, I met peoples, i been through circumstances, Maybe i am not sure what i know much about QM, relativity. but what i am sure is that, i dont wanna believe in those concepts.. so, do not raise those topics again infront of me... You are welcome to post your thoughts, but please be in your limits.. its a request... i dont wanna tag anyone cause you all are wise enough to know whom i am refering to... and pls refer the whole conversation before posting ur answer. you get me/my details through FB as "harish kolliparat" Thanks & Regards, Harish K.

OpenStudy (kainui):

If gravity and magnetism are the same thing, then if I put a paperclip on a magnet and hold it upside down, the paperclip doesn't fall. This means the magnet is stronger than the earth. But if the magnet is stronger than the earth, how come my hand isn't attracted to the magnet but I am still attracted to the earth stronger than the magnet? It would seem to be that both the paperclip and me are both attracted to the ground or both attracted to the magnet, but you can see it goes separate ways. Why? Because they're separate forces.

OpenStudy (anonymous):

Well, there is a hypothetical boson called graviton that's responsible for gravity. Several experiments are being carried out to find more solid proof for its existence.

OpenStudy (anonymous):

they are different materials .... please consider that tooo and give me the example again...

OpenStudy (abb0t):

If gravity and magnetism are the same thing, then if I put a paperclip on a magnet and hold it upside down, the paperclip doesn't fall. This means the magnet is stronger than the earth. But if the magnet is stronger than the earth, how come my hand isn't attracted to the magnet but I am still attracted to the earth stronger than the magnet? It would seem to be that both the paperclip and me are both attracted to the ground or both attracted to the magnet, but you can see it goes separate ways. Why? Because they're separate forces.

OpenStudy (nincompoop):

cancer cells causes gravity

OpenStudy (anonymous):

they are different materials .... please consider that tooo and give me the example again... @abb0t

OpenStudy (anonymous):

and medal for you bro ... @nincompoop

OpenStudy (dan815):

If gravity and magnetism are the same thing, then if I put a paperclip on a magnet and hold it upside down, the paperclip doesn't fall. This means the magnet is stronger than the earth. But if the magnet is stronger than the earth, how come my hand isn't attracted to the magnet but I am still attracted to the earth stronger than the magnet? It would seem to be that both the paperclip and me are both attracted to the ground or both attracted to the magnet, but you can see it goes separate ways. Why? Because they're separate forces.

OpenStudy (nincompoop):

how would we disprove that photons are the source of gravity?

OpenStudy (anonymous):

you guys probably heard about the domain alignment thing in materials like para, dia and ferro... so, as you said, i took two materials of same mass (not same wight). and in those materials one is ferro and other is dia.. so if put them in between of a permanent magnet and earth. which will go in which direction... obviously, the ferro will go towards magnet and the dia will come towards earth.. this doen't mean that, dia material doesn't have mass to mass attraction capability. it has, but its domain arrangement is making it negotiable to magnetic attraction field.

OpenStudy (nincompoop):

uhhhh

OpenStudy (anonymous):

But that doesn't prove anything ??pra and dia example is well-known what is strange about that?? can you see any connections with photons in that??

OpenStudy (abb0t):

If gravity and magnetism are the same thing, then if I put a paperclip on a magnet and hold it upside down, the paperclip doesn't fall. This means the magnet is stronger than the earth. But if the magnet is stronger than the earth, how come my hand isn't attracted to the magnet but I am still attracted to the earth stronger than the magnet? It would seem to be that both the paperclip and me are both attracted to the ground or both attracted to the magnet, but you can see it goes separate ways. Why? Because they're separate forces.

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