Electron Definition and 999 Threads

$$ E = \frac{5.0\;\mathrm{V}}{0.020\;\mathrm{m}} = 250\;\mathrm{V/m} F = q\,E = (-e)\times E = -(1.602\times10^{-19}\;\mathrm{C})\times250\;\mathrm{V/m} = -4.005\times10^{-17}\;\mathrm{N} |F| = 4.005\times10^{-17}\;\mathrm{N} a = \frac{|F|}{m_e} =...

If the electron absorbing the photon causes it to change from waveform to particle ? Then what causes the photon to change from waveform to particle when observed ? (That is exposed to another photon).

Since charged particles like electrons are the source of electromagnetic waves how could an electron in water for example moves faster than the speed of light inside water c/n I mean how could the source moves faster than the field it creates because then the fields velocity will become larger...

I'm wondering about phase contrast imaging with a transmission electron microscope (TEM). It's generally accepted that phase contrast arises because scattered waves interfere with the unscattered wave when they meet again in the image plane. It's also well established, I believe, that each...

The summary says it all: the common explanations of the PV effect could easily describe a perpetuum mobile. Just as if a merry-go-round with negatively charged horses could be set in motion by having a stationary positive charge. Somehow, the energy of the photon must be used in order to create...

I've been looking at trends in 1st row transition metals and trying to understand why some d-electron configurations are more common than others for each element, and I'm unable to find an easy pattern. It seems that getting rid of the high energy 4s electrons is an obvious pattern, but the...

How does the classical interpretation of the electron's behavior in Thomson's experiment compare to the modern quantum perspective?

In this thread Ifqm has asked what was the Lagrangian of an electron and a proton interacting together. He proposed a Lagrangian containing electron-proton interaction and the tiny QED field correction (electromagnetic tensor part). His first Lagrangian seems intuitive as a sum of 2 Dirac...

In the questions solution, they conceptually discuss how the DOS for the conduction band becomes larger when ##m_c## is larger than ##m_v##. This then implies that there is "more phase space for electrons than holes", which confuses me. How can you make a statement about the phase space of...

A common explanation for the origin of (some) color is that a material absorbs a, say, red photon and an electron moves from one energy level to a higher energy level, the difference in energy being the energy of the red photon. The material then appears bluish having absorbed the red light...

The answer from answer key is electrons in gas absorb photon energy and causes electron to move to higher energy level. When electrons de-excite, photons emitted in all directions so dark lines occur. My question is if photons are emitted in all directions when electrons move from higher to...

In studying the Aharonov-Bohm effect, a model of an electron confined in a box is used, for example, on page 353 of Modern Quantum Mechanics by Sakurai et al. The box makes one turn along a closed loop surrounding a magnetic flux line. In the derivation, there will be an integration involving...

I am interested to simulate a problem in mcnp6, in which gamma rays (energy let say 10 Mev) incident on a aluminum disk and produce electron spectrum which further move in a gas (e.g co2)cell to produce chernkove radiation. Here gamma produce electron and electron further produce chernekov, in...

Is it because due to all the collisions in every direction, there's always a force that is opposite to another force? Hence acceleration is zero?

Imagine an electric field between two charged plates that is so intense that its energy density is enough to produce real electron-positron pairs. These electron-positron pairs annihilate to produce photons that radiate away. Does the electric field between the charged plates regenerate so...

This pop up on anyone radar? Electron mass different throughout the universe? I don't see how this section could have passed peer review: The masses of electrons, muons, and tau can be explained by the different curvatures of universe, galaxy, and solar system, respectively. I've seen crazy...

Now we have a particle-antiparticle asymmetry problem. But, if we define electron and neutrino as antiparticle, will there be a problem? Original formula Modified formula Original formula Modified formula If the classification of electron and neutrino is changed to antiparticles, the...

If the nuclei are so small and they don't emit photons, aren't we just beholding the symphony of electrons?

Is the drift velocity of gas' free electrons during the gas discharge higher than the one of the conductor's electron fliquid while the voltages supplied to these two substances are the same?

I know the field I don't know whether the field will be uniform inside the cavity or not. If it is, I don't understand how or why the electron will move. I got the force(considering uniform field inside the cavity) as epr/3E0. But then again I don't understand how the electron will move. If I...

Does anyone know how to calculate the coefficients for higher order (sixth and beyond) terms for the electron anomalous magnetic moment? I have a clear understanding of calculating the Schwinger term, but beyond that I cannot find anything in the usual QFT textbooks. The usual papers often...

Hi. I am a high school science teacher (A&P, Chem, and Environ Bio & Eco) so my understanding is limited on subatomic particles...please forgive me if this is a really stupid idea. I teach my chem students about electrons, orbitals, electrons' "address" using the four quantum numbers, 1s2 -1/2...

TL;DR Summary: Find the possible outcomes of ]##L^2## and ##L_{z}## and their respective probabilities of an electron of an idrogen athom with function: ##\psi(r) = ze^{-\alpha r}## Hi guys, I have a problem with this exercise. The electron of a hydrogen atom is found with direct spin along...

What happens when electrons flow in two opposite directions in an electrical circuit?

If you think of electrons with spin as bar magnets, you know bar magnets of opposite polarity when put next to each other in any respective rotation don't cancel each other's magnetic field out. So what's a more apt analogy for electron paired have no magnetic field?

Influencing electrons angular momentum You can use magnetic fields to influence the intrinsic value of angular momentum (spin). When an electron interacts with a magnetic field it experiences a force known as torque – twisting force in the direction of the magnetic field. Therefore, if you pass...

I'm asking mainly about part (c). Within the context of BBN, I'm a little unsure how you account for different baryons (i.e. does ##n_b## include neutrons, protons, hydrogen and helium, given that helium itself contains both neutrons and protons?) For completeness, for part (b) I would just use...

According to STR: E=MC^2. When an electron and proton are independent( without influence of any kind of fields, especially electrostatic fields )their rest masses are Me and Mp. When they combine to form Hydrogen atoms they emit photons. So, some energy loss in the form of photons. So, now...

Flash memory depends on tunneling in order to work—electrons have to tunnel through an oxide layer. Now, the wavelength of an electron is at most 24 pm. An atom is on the order of 100 nm wide, and the oxide layer must be at least several atoms thick. How can there be any significant tunneling?

Let's take the example of an electron in of a hydrogen atom . It continuously interact with the proton of the hydrogen atom . Both the proton and electron are continuous interacting with each other. It is said that wave function collapse when it is being observed or observers interact with it...

I have been doing some reading on electron reconstruction from proton-proton collisions at CERN. In some of the papers I have read, plots such as the one In the figure are included. What I would like to know is why they have chosen to plot the x and y axes as cos(phi) * tan(theta) and sin(phi) *...

Kuusela https://research.utu.fi/converis/portal/detail/Publication/32053938?lang=en_GB (published in AJP) (PDF here) describes a pseudothermal light source that can be built easily in college labs, and can be used to do some quantum correlation experiments. They propose this as an alternative...

Can we describe / explain the B x v force in the electron's own reference frame without reference to relativistic invariants, 4-vectors, tensors et al? The aim would be to explain things like the following video without the notion of "field lines" that electrons and wires move through. But the...

Homework Statement: Real world application of freshman physics Relevant Equations: TBD This is not a homework question, this is relevant to my work. It seems simple enough (introductory) but I keep running into problems. An electron is emitted from an surface (material is irrelevant, could...

Showing the motion is simple harmonic seems routine. The 5th equation on p. 674 gives ##E=frac{1}{4\pi\epsilon_0}frac{qx}{(a^2)+(x^2)}^frac{3}{2}##, but matching expressions for ##\omega=k/m## yields only ##x=frac{ea^2}{2}##. Something in the model is escaping me. Thanks for any help offered!

Quarks and electrons have clear electric polarity. So, can we assume that an electric source as electromagnetic is needed to create those kinds of particles?

Thanks for including me in this forum. I have a few questions on photon-matter interaction, that hopefully someone would be kind to assist in, Johan

hi, while studying Majorana mass term can be added for the neutrino - as they are neutral - but cannot be added for the electron -as it would violate the charge conservation - i could not understand how charge conservation for Majorana mass term of electron is violated. kindly help

Hello everyone, I have the problem above. I chose to put ##F_G = F_Z## to solve it and end up with a radius ##r = 1.04\cdot 10^{-7}##m. Solutions on the internet choose to put the gravitational force equal to the centrifugal force and obviously end up with a completely different solution. I...

The peak of the radial probability density for the 1s state is at the Bohr radius ##a_0##. But if we consider equal volumes as cartesian boxes, can one fairly say the electron has a higher probability of occupying a box near the nucleus than elsewhere because the peak of ##\psi^* \psi## is at zero?

I've known for a long time that the muon mass is approximately 3∕2×137 times that of the electron, as in Nambu's empirical mass formula from 1952. I recently wondered what the difference was as a multiple of the electron mass, using current CODATA figures for the muon to electron mass ratio and...

An electron requires an "exact" wavelength photon to transition from one level of an atom to another. Yet the wavelength of a photon has a a continuous probability distribution, implying that the point probability of achieving an exact wavelength is zero. One can only talk meaningfully about...

I've been looking at a practice test for an introductory class in quantum physics, and I've found a really weird question. It asks for an estimation of the force that an electron exerts on the walls of a box of known length during a collision. This seems like an entirely nonsense thing to ask...

ik this is basic knowledge, that all groups go up in reactivity the further down you go in the group, except for group 7, where this is reversed. however i don't understand why, because in group 7, the electron shielding still increases the further down the group you go, like with all the other...

I know that the Heisenberg Uncertainty principle states that the position of an electron is uncertain, however, if an electron is created due to beta decay, then at what location is it more likely to begin its movement? Is it right inside the proton? Is it the outer edge of the proton? Is it...

Hello! I want to get the electrostatic interaction (between and electron and a nucleus), while accounting for the fact that the electron can also be inside the nucleus (e.g. in an S##_{1/2}## state). I ended up with this double integral...

I am doing the Millikan Oil Drop experiment to determine the charge of a single electron. I have been following the lab manual provided by the manufacturer, https://hepweb.ucsd.edu/2dl/pasco/Millikans%20Oil%20Drop%20Manual%20(AP-8210).pdf. The manual defines a simple method to calculate for...

I have read, what I believe, misleading articles about generating entangled electron pairs. Some suggesting the electron is split. But this isn't possible because it's an elementary particle with charge/mass and Spin properties. So how do we achieve generating entangled electrons with opposite...

I just want to elaborate the wave nature of electron from davisson and germer experiment . there is resonance of energy (54 ev)provide to electron for which it show wave like behavior's. give some better explanation for this.