Modern and Theoretical Physics

I read a bit about string theory but i don't really get the idea. Can someone explain it to me clearly, perhaps in a way that i can visualize it?

When photons collide with the surface electron of the solid surface, electrons are released from the surface. We know the photons energy is transformed into electron release. Then, Where are the photons gone?

I'm aware that this question may not have any kind of meaningful answer, but I was looking for conceptual images of superstrings and the results are varied to the point of irrelevance. Of course it is difficult to make a two dimensional image of an entirely theoretical structure, but surely there must be some consensus. Some of them looked like ribbons wrapped around each other like an Escher sketch, and others were nothing more than neon squiggly lines. Aren't superstrings one dimensional? The ribbon would appear to the least likely in that case.

Hi, i was wondering, in the grand design, when hawking talks about the recent theory of time. Is he actually talking about time - as a dimension of space - unfolding with universal entropy or as it..

I'm wondering about this. There is a gravity in the Universe. And there are many black holes . At the beginning of the Universe galaxies are very close. But there is not super massive galaxy . Why this phenomena happen? Any good opinion?

We know proton is made of quarks. When we come up the temperature continuously the proton is divided into quarks. How high is the temperature?

I'm sorry, but this may be a long post. I think about physics quite a bit, and question everything. Lately I've been thinking about the big bang and the problems associated with it. Like dark energy. The way I see it, with my limited understanding, we had a good theory with the big bang. That is until the discovery that the expansion of the universe is increasing. This showed that something was fundamentally wrong with our understanding of the universe IMHO. In stead of trying to figure out what was wrong with our theory, science simply made up something that would make our theory work. Dark energy was born. We can make any theory work, if we get to make up stuff as w…

Is straightline motion possible in a three dimensional space? All large scale structures inthe universe move three dimensionally. So can we say that only three dimensional motion is possible in a three dimensional space?

What if smaller objects instead of falling slower due to low weight fell because we saw the object fall from a faster time-frame. I say this because scientists say that a fly can actually maneuver faster then physicaly possible. This could be because the fly is veiwing it from a slower time-frame and has enough time to fly around. What I'm saying is that larger objects might veiw time slower and smaller ones faster. (This is all just a idea and its probably not correct!)

There were many discussions about traveling of the light through the vacuum before. It's important. How to travel the light in the vacuum? There is no medium to transfer the light wave.

Hello everybody, im wondering if you can combine Electronic (shocks) with light rays. so, once the light hits something, it gives an electronic shock to it. im just wondering if this is possible and HOW this is possible to do/make/create. example: http://www.google.nl/imgres?imgurl=http://www.chalende.nl/inc/nieuws_img/Onweer04_0.jpg&imgrefurl=http://www.chalende.nl/%3Fpg%3Dnieuws%26page%3D3%26rowsPerPage%3D5&usg=__u7WzvRyICe2ztNAPIDWwt_YQFf0=&h=1200&w=1600&sz=151&hl=nl&start=0&sig2=lWgB3m-nC5zBcyUGIY-2bQ&zoom=1&tbnid=GNR2cUtiIYYFQM:&tbnh=162&tbnw=229&ei=FesdTYbaGoGW8QONo83-Bg&prev=/images%3Fq%3Donweer%26hl%…

Hi, i was wondering how many superstring theories there are, what exactly a superstring is - i mean it obviously encompasses susy in string theory, which i also dont really understand. i mean string theory is a theory of strings in place of point particles (quarks), but how exactly can you combine it with susy... i guess my question is - how exactly can strings themselves relate at all to susy... also, why and how does gravity become infinite as you approach a point particle and how does string theory predict susy or visa-verse.. thanks..

I have heard once that antimatter is similar to regular matter, execpt it has the opposite charge AND it is travelling backward in time. I am not exactly sure the source from which i got this information, but i would like it to be clarified. How does it work? How did someone discover this? and why does it make sense?

Hi; Guys, A college student asked the question if a photon has physical volume or geometrical size. Does anyone have a good answer? From the particle point of view, it should have volume/size; from wave point of view, it should not have volume/size. A photon travels from a remote star to the earth (Billion years), does not fall apart during the long journey, it should have certain volume/size.

The information we perceive via our senses is essentially patterns of photons, sound waves etc. These signals are being picked up and manipulated by the brain. Is this process associated with an increase amount of energy reaching the brain? I don't mean increased metabolism therefore more energy, what I mean is does information (of any sort) carry energy? More generally, if we input information and data into a computer, does its internal energy increase? If we input meaningful information into a system, does its entropy decrease?

is the total enrgy in the universe constant,or a variable?if it is a constant,exactly how much is there and where did it come from?is it zero?if it varies,then waht makes it to vary?if it is zero,and we assume that the energy of universe is constant,at the time of big bang,the energy was zero,so what prompted big bang. sorry,i dont know much about theoritical physics.after all,i'm just a 9th grader!

We know well heat conduction macroscopically. Metal have a good property to conduct heat. But we deeply don't know heat conduction mechanism microscopically. How the heat flow form here to there? Any good opinion?

http://www.disinfo.com/2010/12/astronomers-find-first-evidence-of-other-universes/ Scientists have evidence that the universe is in an infinite cycle, does this mean that in a universe in an infinite cycle means that every possible thing will happen at some point? Im not to sure how to word this.

I have heard that the higher vibration of superstings or something of the sort can cause normal matter and particles to become sparticles. right? I really dont have much of an idea on these strange particles. sprotons and... sneutrons (hahah)? And, is there a possibility that along with sparticles comes anti-sparticles as well? Explicame!

Very small scale detection, how can we make? About visible light photon detection. Without amplification, how small amount of photon can we detect? Photon might hit electrons on the solid surface and make free electrons. At that time we have to consider lower limit of photon energy and photon number. Produced electric current and voltage should be sufficient to detect. The lower limit?

I'm wondering about this. Which state is the proton and neutron in the Deuterium? They only have contact with each other. (uud)(udd) Or they have another strong force system-like electron orbit in the Atom? Does quark have individual property or have combined property?

I saw a story today about a theory of the universe where they examined the Cosmologic Microwave Background and determined that it means the universe may have existed forever! http://www.economist.com/node/17626874 Their analysis shows that the universe may start very small then get large until it is eventually devoured by black holes and loses mass and becomes small again. This cycle repeats over and over for all eternity. I have always wondered if the universe has just existed forever. It is one of those questions that science may never answer until it is too late, but it is fun to think about. I know religious people who ask me what is the scientific answer …

does the leidenfrost effect apply to sublimating solids as well as evaporating liquids?

Present we never make below 0K. And Thermodynamic law tells us there is no degree below 0K. Why we do not make below 0K? Are there any materials below zero? For example unknown matter. We say it Dark-matter. Are there any possibilities below 0K Dark Matter existence? It's freely moving below 0K.

Some scientists say, that the LHC can "recreate the conditions [quite close to] of the Big Bang". But, what if our Cosmos is Closed ? Then, mere moments after the Big Bang, Space was still "Hyper-Curved", compared to today, after space has expanded for 14 G.yr., and is not very far from Flat. Unless the LHC can recreate those conditions of Hyper-Closed-Curvature, as the "backdrop" for the LHC particle collisions, then High Energy collisions in Flat space (today) != High-Energy collisions in Hyper-Curved Closed space ('Big Bang') (conveying the concept, if being a little imprecise w/ words).