Electrons Definition and 998 Threads

Hi, I am aware that the reason why objects have color is an old subject. However I come across two claims which sound like they are in contrast to each other. On one hand I read that the photons with specific frequency in incoming light are absorbed (i.e. have enough energy to move an electron...

I'm conducting a research about making a electron gun. I first tried to detect electron using nuclear emulsion plate. But I couldn't purchase one near my town. So, instead, I'm thinking about using a x-ray film to detect electron. But I'm not sure it'll work. SO, IS IT POSSIBLE TO DETECT...

This is related to the thread "Is quantum theory a microscopy theory?" discussed mostly by Ph.Ds. I make this new thread so as not to disturb the experts discussions or even hijack or close it prematurely. In message #27 of...

Suppose , there is a body B1(-vely charged) and body B2(+vely charged). When both are on contact, electrons move from B1 to B2 as B2 is having electron deficit. But is reverse also possible that protons move from B2 to B1 as B1 is having proton deficit.

In this article, writer says that when atom is hit by photon it gets excited and expelled out of atom and this can be used to form images. My questions are: Why didn't the electrons get to a higher energy level, instead of getting knocked out? How do we find the color(frequency of wave) using...

a) We can solve for acceleration by looking at FNETy FNETy = FE (G is negligible) FNETy = m * a The mass (m) of an electron is 9.1093836 x 10-31 kg. The elementary charge (q) of an electron is -1.60217662 x 10-19 C a = ε * q / m a = (4.0 x 102 N/C * 1.6022 x 10-19 C) / 9.1094 x...

If i get this right: In space when electrons leave its atoms, do they attach to something else? Or is the electrons bouncing freely in space when they get detached? Is this because of dark energy? And if so, where do they go? Do they move between atoms or are the free to go anywhere? And where...

(I have very little training in Quantum mechanics) Can the Shrødinger equation show the probability distribution of the electron when it jumps from one atom to another, like in a circuit f ex. Thanks!

I've managed to stump myself in attempting to answer a member on another forum. He is attempting to demonstrate length contraction using two electrons a known distance apart and moving at a known velocity.My thought experiment is based on his proposal; that's why I've chosen the components I...

Good evening guys, I have to give a talk to my thesis on Friday, and I would like to show a simple animation of electrons moving in a metal according to the Drude-Lorentz model. In this model, the electrons are classical particles that elastically scatter at spatially fixed atomic cores which...

I have heard that wavelike interference patterns are observed in the double slit experiment even when electrons are fired one by one. https://physicsworld.com/a/the-double-slit-experiment/ My knowledge on the experimental setup is very basic. The reason I am posting here is out of curiosity...

I understand that the energy of an electric field arises from the work put into gathering the electrons together to create the field. Bringing electrons close together requires energy because they naturally want to repel. This potential energy is stored in the field itself and the field has an...

In 8a) I don't understand the question, does spin = 1/2 mean the magnitude of the spin or the z-component of the spin is 1/2? Can the electrons possesses be any of the spin=1/2 or -1/2? Are the electrons distinguishable?

In https://en.wikipedia.org/wiki/Lamb_shift about the lamb shift, it's mentioned that the change in the electron's frequency due to QED effects (vacuum polarization and self-energy correction) is about 1 GHz, which would translate to an energy change of hf = 6.63E-25 J. This is 3E-7 times of the...

Why there is not voltage or current just for 1ms if I connect a multimeter ground to the negative terminal of a DC power supply or charged capacitor? Why electrons in measure lead and DMM device cannot sense a bulk of electrons (or lack of it)? I tried with an 5kV DC power supply too. In an...

The full questions is in the picture. I already solved a) and found 5.6E14 electrons per second For b) i first found the power of the light but just multiplying the intensity with the area: (6.0 W/m2)(3.5E-4 m^2) = 0.0021 W Then I tried to use the voltage from the graph but i am not sure which...

we know that when a electron lost its energy , it will emit photon , but why electron have a photon inside ? does it already exit in a electron from the beginning or it comes from environment ? if comes from environment , where does photon come from?

I'm a bit confused as to why can't you transmit AC current over a single wire. For instance, say you have an AC generator which induces potential difference at different points of the wire and thus, creating current. Downstream, the wire can be split and applied to a load. When the wire is...

Can anyone tell me how to mathematically represent 2 phased electrons mathematically? Thank you in advance.

If at high energies the electromagnetic and weak force are combined into one electroweak force, then at high energies, the electrons will not create an electrostatic field and will not repel?

Homework Statement I learned that Covalent Bonds form between different specific atoms ( with similar electro-negativity ) with electrons. However, I wondered what type of bond would form between the different atoms if they had no electrons? Also , if I have 2 atoms with similar...

The two electrons will be repelled by electrostatic force, but they interact with weak force, means that in addition to the electrostatic force between the electrons there will be weak force?

If is yes, under which conditions?

My concern is an electron tube. From what I understood so far, gas molecules will have an average velocity derived from the Maxwell distribution, and that velocity will influence in the electron collision frequency. I can't see clearly though how the electron velocity itself in the presence...

If an electron is divided into quasiparticles in a material, then at the contact between the two materials does the interaction only occur between holons, since they carry a charge?

Hi i am posting this to double check my work. Please help and feel free to ask any questions. I posted a picture of my work and what i currently have. 1. Homework Statement Two small insulating objects are hung from strings attached to the ceiling. The masses of each object is 0.0076 kg. The...

I'm looking for images of electron or ion beams recorded (from the side) using electrons, for example with a transmission electron microscope. Does anybody have references to publications?

electrons are repelled using the Pauli exclusion principle?

In qft electron can be considered as composite excitation in several fields?

How do I work out the voltage between two stationary electrons a given distance apart apart? I understand the definition of a volt and I guess that I would need to use Coulomb's law and integrate with respect to distance. It would be great to see the maths though as the answer that I got seemed...

I am reading and trying to understand “Spooky Action,” an article that has been published in Scientific American, December, 2018, starting on page 60. To begin: 1) How does one create a pair of entangled electrons, especially with spin sideways? 2) How does one then isolate one electron from...

Is the wave function for the positron the complex conjugate of the wave function for the electron? I've tried to google this, but I can't seem to get a definite answer from a reliable source. It seems that antimatter is derived in quantum field theory which does not concentrate on wave...

Hello ,evreyone.I have two questions about fermi energy. 1,Can I claim that 'fermi energy ' play the role of chemical potential? 2,I have learned from thermal physics that only electrons near fermi level can conduct in metals.How can electrons behave like this? I can't figure out why only...

Hello, this is my first forum question, so i hope it's at the right place. My question is about electrons, i know in a QM view electrons don't have a well defined position or speed. However i am curious, in a classic view of the electron would electrons closer to the nucleus move faster then...

Electrons and positrons are assumed to be point masses. Two points presumably can never actually touch. How close do they have to be before they annihilate each other?

If electrons move as current flows through a conductor, what happens when a wire is grounded? Do electrons flow in the ground?? If they do, will it effect the number of electrons in the circuit which starts from power plant such as dam and comes to our homes through a grid station? Will it not...

Does electrons or other particles attracted towards a magnet due its magnetic momentum?

Suppose you have a pair of electrons in the same quantum state, and are thus spin entangled, and they absorb a pair of photons and release them at the same time. How would this affect the photons? Would the photons be entangled? Would it affect the photon spin, and if so, how would it affect the...

Hello, I don't understand how can electrons in triplet state can have the same value of spin? Shouldn't the spins be different because two fermions can't have the same state? The following picture explain my question in more detail.

Historically, quantum mechanics, or wave mechanics, arose due to the anomaly that accelerating free charges ( electrons ) radiated EM waves. The quantisation theory provided a solution. Quarks also have electric charge, and are moving at relativistic speeds, and bound in the nucleon. As the...

Does in QFT static electricity work classically or is there a more fundamental explanation?

Please let me know if the following reaction is possible for high energy electrons colliding with neutrons or neutron-rich nuclei: n+e^{-}\to \Delta^{-}+\nu_e.\tag{1} If it is forbidden for some conservation law or for some other reason, please give me an explanation why. This reaction is...

Homework Statement Long and thin sample of silicon is stationary illuminated with an intensive optical source which can be described by a generation function ##G(x)=\sum_{m=-\infty}^\infty Kδ(x-ma)## (Dirac comb function). Setting is room temperature and ##L_p## and ##D_p## are given. Find the...

When an electron leaves a conductor and tunnels through a thin dielectric; how does it behave in the space occupied by the dielectric? Does it behave like a ballistic electron traveling through vacuum? Is it instead that the electron never really occupies the space in the dielectric?

So, I've been reading a whole bunch of different answers to this online. Some people say yes, some people say no. I'm totally confused...

In electron cyclotron resonance of metals/solids can there be electron acceleration without them engaging in collision ? I read the last para of electron cyclotron resonance wikipedia page which stated this

In @A. Neumaier 's excellent Physics FAQ, he notes under "Are electrons pointlike/structureless?" that "Physical, measurable particles are not points but have extension. By definition, an electron without extension would be described exactly by the 1-particle Dirac equation, which has a...

Could one make a negatively-charged insulator with the extra electrons trapped all the way through its volume by building it up layer by layer with electrons "sprayed" onto each layer as it was constructed? I guess the electrons would be trapped in empty atomic orbitals within the material - is...

If an electron is moving in a circle in a magnetic field, it produces a magnetic field in accordance to the right hand rule. If a proton is moving in a circle in a magnetic field, would it produce a magnetic field in accordance to the left hand equivalent to the right hand rule.