Physics

I ordered MICR toner refill to make ferromagnetic fluid. Can I use the MICR toner refill to make magnetic fieldlines visible like I do with Iron powder? Can I make ferromagnetic fluid with iron powder?

I would like to do the double slit experiment. How big can the distance between the two slits maximum be? Can I make the double slit with 3 toothpicks? Can I show the particle behavior using a laserpointer and a self made double slit?

Hi all. LEDs operated in pulses over ~30 Hz are not perceived by the eye as pulsing but continuous emission of light; is the lumens emitted same in pulsing effect than if ran on DC at full power/constant current ? (pulses being also at full peak power) Operating LEDs in AC, the emission of light occurs only when the LED voltage Vf threshold is surpassed, and at the rest of the waveform, they are 'off' If the frequency is high enough, the 'fast intermittance' is not perceived. Do sensors to determine/measure luminosity of a light source respond with different lumen figures in pulsed and DC current ? In other words, constantly lit LEDs produce more lumens tha…

Hi, I'm no mathematician or physicist so please be gentle. I came across the double-slit experiment a few years ago and it left me stunned, the same goes for Schroedinger's cat. More recently I came acroos the Navier-Stokes equation and whereas I have no idea about the mathematical aspect of the thing, I understand that the problem is to explain why a stone in the water cannot cause a tidal wave. I know that a simple yet stunning "solution" to the double-slit experiment is to say that the result is merely a distribution of probability, which in itself is verifiably correct. I cannot offer mathematical solutions for all these problems, but can't it be…

Why is there something rather than nothing? I know that matter and energy are interchangeable (one can be converted into the other) but can matter and energy come from nothing? Did the universe come from nothing or is there something which is eternal (has no beginning and no end) and this eternal thing is the cause of everything?

Ive been using a material called Graphene to try and create a device that can Store and Increase Photons. So far Ive been unable to do this. 1. You need to create a very small pea sized ( doesnt have to be pea sized ) sphere made of epoxy and graphene. 2. You need a new type of material or fluid that is packed with electrons to mix with the epoxy and graphene. " I dont have this " My Theory.. When Photons or preferably daylight enters the sphere, it creates a reaction between the graphene and the electrons which then magnifies and increases the Photons... At the same time the Graphene prevents the Photons from escaping the sphere. At that point when you remov…

So I was watching this interesting video of Leonard Susskind: He stated something along the lines of how bits of information can never be lost and how that concept is a part of the foundation of physics. What are bits of information and how do they relate to physics? Edit: grammar

http://www.dailymail.co.uk/news/article-2746727/Maybe-shouldn-t-looking-quite-hard-God-particle-destroy-universe-warns-Stephen-Hawking.html Apparently someone thinks the Higgs Boson could destroy the universe... Do you really think human kind could ever have that power The only thing you will destroy is the earth... One Higgs Boson does not mean all higgs bosons.... One particle does not equate to all the particles in the universe..... Why do people create these assumptions that having understanding over a particle gives them the power over the entire universe? The higgs boson exists in all particles, even in me, so how come i have not felt anything when …

If you wanted people to post factual ideas, you should have called these forums factual. Otherwise people will post their ideas that relate the forum label...

Im going to start this of with something most people dont really believe in.. Daja voos. Be Open Minded while you read this. I once experienced a daja voo, and then asked the people around me if they also experienced it, many of them told me they also experienced a daja voo in the same moment I did. Short and Sweet. Daja voos are caused by anomalies in memory, But anomalies in memory are created by the distortion of space time when a gravitational wave passes the earth. When the gravitational wave passes the earth it pushes the spacetime of the future into the present, at the same time it stops spacetime for a fraction of a second or seconds and once the gravi…

Hi guys, This is the scenario: a car moving at 20 mph in a vacuum (gravity exists). I drop a ball (just drop, not throw) out the window. What happens to the ball? Straight down? Forward? Backward? Thanks

Say you have an iron ball set in a chamber, with a row of electromagnets on one side of the chamber wall; Each electromagnet switches back and forth between emitting a positive or negative electromagnetic field into the chamber, and the row is setup so that each electromagnet emits an oppositely charged electromagnetic field into the chamber from the electromagnet(s) next to it. Now, here is the paradox: Will the iron ball ultimately roll towards or away from the row of electromagnets? My intuition would suggest that the electromagnets would cancel each other out -- or that imperfections in the construction of the setup would lead to a favored outcome. But, my hyp…

Hello, **** At the beginning I would like to apologize everyone for my bad eglish. It's really hard for me to write about all this things in foreign language. But I will try For many years I was interested in physics, mainly lasers, high voltage and acoustics. I analyzed many possible combinations of use of this elements. I built dozens of lasers, high voltage generators, checked the behavior of lasers on the different conditions (eg. changing magnetic field, electrostatic voltage). One day I noticed the influence of acoustic waves on a UV laser beam. An acoustic wave with a frequency around 28-30 [Hz] has put a beam in vibrations. This effect was hardl…

Hi, i'm stuck on part b) of the question below:[/size] Q: In order to perform pH determinations with a glass electrode, the cell potential was measured for threestandard solutions with the following pH values at 25 Celsius: 2.04, 7.05, and 9.20. The cell voltage readout(in mV) for each of the above solutions was 238.0, -37.5 and, -164.5, respectively. Calculate: (a) thesensitivity of the pH sensor; (b) the pH of an unknown sample yielding a cell voltage of 20.5 mV; © thepH deviation from the actual value if the sample temperature is 35 Celsius. My Ans is in the image below, click to enlarge.

Can diamagnetic materials like superconductors act as shields against magnetic field?

Couldn't the refraction of light as it passed through the sun's corona explain the results of the 1919 solar eclipse experiment? Light bends as it passes through a medium; The sun's corona stretches far into space, with increasing density towards the sun's surface. Even past the corona, the sun's gravitational pull still attracts dust particles in orbit around it.

Hi everyone. I'm not an expert, so forgive me for my ignorance. My question is, if we can see a star that is 13 billion light years away, we see the light of this star as it was 13 billion years ago right? So, if we see a star 13 billion light years away and 13 billion years ago, does it mean that this star was 13 billion light years away 13 billion years ago? I don't know if I explained it right, and my english is not so good, but I hope somebody understands. Thanks!!

Hello Guys, I would like to ask you: How do I become a theoretical physicist? I don't want to have a major in theoretical physics, just a minor, so what are the majors that I can have, while having a minor in theoretical physics? What fields can I study? (Relativity, cosmology, etc) I'm not good at math, so what is the solution? What requires math and what doesn't?

I'll try explain this as best i can without sounding too simple. Essentially we're saying that after 7 billion years this "dark energy" has started to expand the universe at some exponential rate (cant remember the exact exponent). Anyway as a parallel, if we take a normal explosion for example and scale down the time into nanoseconds (or some other minute time variable) then we would be able to see the initial reaction happen such that the chemicals react (with one another or heat etc) we would see the actual chain reaction in nano seconds so initially we're seeing one chemical react with the next creating a larger and larger force as it goes. If it took say 7 nanose…

When a atom floresces an electron drops down an energy state and a photon is emitted. Is it correct then to say that photon is a part of the atom? Is there any specific place it resides. Was it a part of the electron? If it isn't a part of the atom and only carrying away energy, is there any preference in the process for which photon it embers? IE does it choose the nearest, ones travelling in specific directions etc over others? If it is neither of these and the photon is created, where does the photons other property, spin come from?

Experiment analog of a scattering an a-particles by matter of a Rutherford. Can you give me results, please if it was?

2 simple questions really, 1) Shouldn't black holes essentially counter balance dark energy? Given the huge amount of gravity they have. 2) Could the streams of energy that are emitted from black holes be dark energy? From my basic understanding black holes release jets of energy almost at the speed of light, this would seem to act as a propelling agent other against other galaxies or forces. (from what i hear the dark energy started to make a major impact after 7 billion years, this could be the amount of time needed for there to be enough supernova's and hence galaxies with sizeable black holes) (i know these 2 idea's are contradictory, im just a littl…

My father who is a mechanical engineer seems to think that something cannot come from nothing but I think that he is wrong because my father evidently never heard of virtual particles and quantum field theory. Another thing my father believes is that mathematics doesn't really exist in nature but again I think he is wrong on that one too because the evidence shows that mathematical relations and functions are an integral part of physics and that physics cannot really be done without the mathematics. So in other words mathematics is part of our reality but my father who is not a physicist does not seem to grasp that.

I'm curious as to the nature of the birth of our planet, primarily because were sitting on alot of molten hot iron, and i cant imagine how we would have a molten iron core unless we were a star or a star created an almost perfectly spherical drop of iron, or if 2 stars collided and we managed to grab aload of iron from the process. I know iron is the one of the most common element in the universe but i thought that was mainly due to nuclear fusion from all the stars, most of which dont make many elements bigger than iron. I'd imagine if we were to have been made though gravity and bits of iron they would be solid due to how cold the universe is. Is it common for planets t…

A spring of mass m is pulled such that a given instant, velocity of both of its end is v in the opposite direction. Find the kinetic energy of the spring. I tried Lets find the kinetic energy of half of the spring. Its velocity changes from zero at center to v of its end. The average velocity of half of the spring is v/2 . The kinetic energy of half of the spring is 1/2 (m/2)(v/2)^2 The kinetic energy of the spring is (m/2)(v/2)^2 Hence my ans is mv^2/8 But ans is mv^2/6