Questions tagged [electrons]

Negatively charged particle with spin 1/2. A component of mundane terrestrial matter, and part of all neutral atoms and molecules. It has a mass about 1/1800 that of a proton. Its antiparticle is the positron.

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What happens if you connect a wire to the anode of a battery, but not the cathode?

My understanding is that the anode of a battery is positive while the cathode is negative. If you connect a wire between the cathode and the anode, then the electrons in the cathode want to flow to ...
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160 views

Special conditions at layer F2 ionosphere

I saw this graph about the electrons density in different altitudes and difference between night and day, the difference between the 2 electron densities (day and night) decreases till 300 Km (F2 ...
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Band gap vs QM energy level gap between electron orbitals

I have read this question: What is energy band gap? What is the reason for formation of energy bands? https://en.wikipedia.org/wiki/Nuclear_shell_model If I understand correctly, the band gap (...
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263 views

Using uncertainty principal to estimate electron energy

I'm trying to estimate the energy of an electron, using the uncertainty principle. Not sure if I did it right. The problem is estimate the energy of electron confined to a .1nm box and report answer ...
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Recombination of hydrogen

Suppose a slow-moving electron and a slow-moving proton are injected into a chamber, such that the two approach each other and are likely to combine to form an atom of hydrogen. How would one ...
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4answers
212 views

What makes north pole of a magnet north pole in the first place? [duplicate]

This question might seem absurd and illogical to many. But it just popped out in my mind while I was reading about magnetism. -Like in case of charges, positive and negative charge on an atom means ...
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533 views

An electron moving through a magnetic field [closed]

An electron, that has been accelerated from rest by a potential difference of $250\ \rm V$, enters a region of magnetic field of strength $0.12\ \rm T$. Show that speed of the electron after ...
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Franck–Hertz experiment question

Greetings fellow Humans. I have been given a problem as the following. In a Franck–Hertz experiment, the jumps in Voltage in the characteristic Curve are U=2.104 volts. a) What color does the Gas ...
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43 views

Covalent bonds are EM (electrostatic/electronegativity) or not?

This is not a duplicate, I am not asking why covalent bonds form or how they form. I am asking whether the covalent bond itself can or cannot be classified as a EM interaction (or if it is caused by a ...
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226 views

Why is lightning going from the Earth to the clouds while the electrons are going from the clouds to the Earth?

The lightning is often a discharge in advance. The (negative) charge slide occasionally a little further on in the conductive channel, wherein said channel is highlighted each time something. The ...
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241 views

Electron mass from “Higgs-like” interaction with $Z$-boson?

I was watching a Leonard Susskind video, "Demystifying the Higgs.." https://www.youtube.com/watch?v=JqNg819PiZY At some point he is discussing the Z-boson and what he terms the Zilch field. (weak iso-...
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How can the velocity of electrons in graphene be measured?

I'm trying to understand how one can measure the velocity of electrons in graphene, from an experimental point of view. Does anyone have some clue?
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369 views

Opacity/transparency of conductive meshes to charged particles (electrons/ions)

When using a conductive (metal) mesh, effectively a metallic woven fabric, in vacuum applications as a "grid" for charged particle optics, how does one calculate (or at least estimate) the opacity or ...
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52 views

Why cannot electrons be accelerated by cyclotron?

I was reading about cyclotron and it's working. I found out that electrons cannot be accelerated by this device. The reason I found was that they are too light. But I want to know why exactly ...
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365 views

Do battery electrons only move if there is a positive terminal at the end of the wire?

I'm sorry if this question may seem wrong in many cases. What would happen if we had a wire with the length of 1 kilometer that connected the two terminals of the battery? Do electrons care if the ...
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53 views

Diffraction pattern of X-ray and electron

Electron diffraction is used to study about wave - particle duality of matter. A beam of electrons directed at a single crystal produced a diffraction pattern like an X-ray diffraction pattern. I ...
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127 views

Difference between Phonons and heat?

1, if these two were the different then how we differentiate with one another?. 2, if these two were the same, then what is really vibrating?, atom in the lattice or electron in the atom or the bond ...
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Is the screen in CRT connected with a positive pole?

I don't understand this passage would you clarify it? "These electrons are then freed (liberated) from the metal and are then picked up by the screen, which is connected to a positive pole called the ...
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Velocity Selector Question with Unknown Voltage

In a diagram, electrons are emitted from a hot coil with initial velocity 0 at plate A and then pass through a uniform field between two plates (A and B) where $V=1.00\times10^4$ volts. After, they ...
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How can light travelling forward send an electron forward?

Light travels along the x-axis and strikes a stationary free electron. Its E field oscillates along the y-axis. The electron moves off at an angle with respect to the x-axis less than 90 degrees. ...
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1answer
70 views

Do photons “bounce off” of electrons?

I’ve been reading a book, and in one part the author explains how electrons only absorb the wavelengths of light that can take them to an excited state, i.e. that can take the electrons to a higher ...
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How are cloud chamber tracks consistent with the uncertainty principle?

I have read about the uncertainty principle. As it applies to electrons, how is it that we can get exact tracks of electrons in cloud chambers? That is to say that how is it that the position is fixed?...
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Joule's heating effect

Can we derive joule heating effect or heating of current using energy conservation for electrons when current is varying with time ?Like using concept of drift velocity,potential diffrence across ...
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128 views

Calculating velocity of electrons in a vacuum tube (read description)

If I use a high voltage DC current in a vacuum tube to bring a lower power AC current into a vacuum tube, how do I calculate the average velocity of the AC electrons?
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57 views

The electric and magnetic field, reaching to infinity

I have difficulty’s to accept that the electric and magnetic field components of photons as well as of electrons and the other subatomic particles are extended to infinity. For practical use that does ...
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Does charging any electrical device in exterme temparature affect the current flow?

Recently in an Electric vehicle(EV) charging station, the charging time to charge a particular vehicle was 1 Hour (18V capacity of battery), but now in temperatures beyond 40 Degree Celsius, it is ...
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127 views

Do the electrons arrive at the anode with some kinetic energy? Where does it go?

I'm studying electronics and circuits. I'm trying to understand how electrons behave as they move in a circuit, but there's something that still bothers me. Electrons have some potential energy (the ...
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258 views

Confusion regarding Hall effect in semiconductors

In many places, it's mentioned that in hall effect, the holes move under the influence of magnetic field in the direction as shown in the figure. In this figure itself, the bound electrons move in the ...
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3answers
190 views

Why are there $1 / 1.602176634 \times 10^{-19}$ electrons in a coulomb?

Why that exact number of electrons in one coulomb? who decided it? there is nothing wrong with the number, it just seems slightly messy. Why didn't the scientific community just settle on an easier ...
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27 views

Why is there no B-field parallel force on an electron orbiting a magnetic field line?

If an orbiting electron creates a toroidal magnetic field like a ring of current does, and this field is oriented opposite to the magnetic field line the electron is orbiting, then why is the electron ...
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49 views

What makes a atom more likely to become a cation (lose electron)

What makes an atom more likely to lose an electron and become a cation? Does the exact location of the electrons maybe influence that? I know that you can't know the exact position of an electron ...
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76 views

How did scientist get photos of wave function of electron in the double slit experiment?

In the double slit experiment I know that the electron fires as a particle one at a time then splits goes through both slits and recombined and interferes with itself and hit the wall creating a ...
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2answers
67 views

Why do atoms interact differently? [closed]

We live in a 3-dimensional Universe, so why don't atoms (electrons) follow the same rules as humans, planets and other 3-dimensional objects? So does that mean electrons and other quantum objects pop ...
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234 views

Why electron and positron annihilate would produce hadron (jet of gluon)?

Electron (fermion) is an elementary particle just like positron and they interact via boson which is photon, electromagnetic force. I like to know why is gluon (hadron) being emitted when electron and ...
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How do electrons exit LEDs? Aren't they in the valence energy state?

If a conducting electron reduces to the valence band in an LED, where does it get the energy to go back to the conductance band upon leaving the diode so current can flow? I'm confused as to how ...
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Can electrons fly off a conductor?

This is probably a stupid question, but what if you made an electron flow through a superconductor so that the electrons build up speed flowing through the wire, and then cut the wire. Would the ...
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210 views

Larmor Frequency for Spin Transition

http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/larmor.html Consider the process of Larmor precession of the magnetic moment associated with the spin angular momentum of an electron inside a ...
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257 views

Is the Pauli exclusion principle also involved in free electrons?

Imagine I want to make a laser of electrons like a laser of light. Is that possible, or does the Pauli exclusion principle prohibit that?
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What is Electron Excitement in the Bohr model?

Is electron excitement the absorption of a photon thereby causing an electron to move to a higher energy level? In my textbooks, electron excitement is implicitly implied to mean that an electron ...
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Do delocalized electrons have different energies?

Consider a molecule with alternating single and double bonds between carbon atoms, such that multiple resonant configurations are possible, e.g. beta-carotene. While using UToko's edx course about ...
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Only one electron?

If it is true that an electron can be anywhere in the cosmos at any given time, then is it even theoretically possible that there is only one electron, instead of multiple electrons in the cosmos? If ...
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What it means that there is only one electron in universe? [duplicate]

Could someone explain if this statement is and what could possible mean?
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Does a spinning electron stop spinning

An electron caused to spin in a magnetic field gives off synchrotronic radiation (Synchrotron radiation (also known as magnetobremsstrahlung radiation) is the electromagnetic radiation emitted when ...
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39 views

Photoelectric effect in space floating metal

I have read this question: Electrical neutrality in photoelectric effect Now the answer by HiddenBabel says: Metals are conductors. As electrons escape, new electrons easily flow from ground ...
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Electron gun design

I have a question about electron guns. I have read a lot, and all designs use high NEGATIVE voltage ($-1000$ V for example). Is possible to use high POSITIVE voltage like this drawing? Or do you think ...
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Electrical neutrality in photoelectric effect

In photo electric effect ,if electrons escape, shouldn't that leave the metal positively charged ??. How does it maintain its electrical neutrality ? And if it doesn't , shouldn't the work function ...
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What would happen if I bring an electron near a conductor

What would happen if I bring an electron near a conductor Charges should be induced, but since a charge cannot be smaller than that of an electron.... Edit :This is not a homework question. I had a ...
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Do electrons have shape?

According to the Wikipedia page on the electron: The electron has no known substructure. Hence, it is defined or assumed to be a point particle with a point charge and no spatial extent. Does ...
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3answers
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Do Maxwell's equations predict that electrons have no internal structure?

As far as I know, Maxwell's equations can't be derived from anything more fundamental. Does this indicate that electrons have no internal structure? I mean to say that, in my view, the entire nature ...
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What happens when we use Faraday induction on a coil that already carries a current?

Consider the following experiment: (1) Attach a coil to a current meter, and run a magnet over that coil, measuring the current generated. This is ordinary Faraday induction. (2) (i) Attach the coil ...