Electrons Definition and 998 Threads

Hi there, I have lately tried to revisit electronics again after a long hiatus. Unfortunately, I am having trouble with basics (which was originally what helped me to fail my post-school education). I've always been interested in particles and their physics and have spent a bit of time...

Homework Statement In Fig. 22-56 an electron is shot at an initial speed of v0 = 4.14 × 106 m/s, at angle θ0 = 43.6 ˚ from an x axis. It moves through a uniform electric field = (5.34 N/C). A screen for detecting electrons is positioned parallel to the y axis, at distance x = 1.64 m. What...

My professor gave us a question to think about for discussion next week. He asked how the radius of a star, who is composed of ionized hydrogen and degenerate electrons, varies with mass. I am not quite sure where to start. How could I estimate the radius?

The title is the question. Thanks.

Hello Forum, in semiconductors, there are two types of charge carriers: electrons and holes. Holes are fictitious positive charges...How can they have a mass? thanks, fisico30

Cheers everybody, I've got a question about an equation in the famous paper "The Effect Of Retardation On The Interaction Of Two Electrons" by G. Breit. There on the first page, it is said, that a first guess for a two electron relativistic wave equation is made by constructing the...

Thanks.

An electron (mass of 9.110×10-31kg and charge of -1.602×10-19C) is released at rest above the surface of the Earth (where g = 9.81 m/s2). A second electron directly below it exerts an electrostatic force on the first electron that exactly cancels the gravitational force. What is the distance...

hi i often heard about the double-slit experiment with electrons and read that it would give the same pattern as the double-slit experiment with photons. so the only difference would be the shorter de-broglie wavelength of electrons compared with the wavelength of ordinary photons. but i...

Here is a problem from a physics text An electron (mass 9.11 × 10−31 kg) orbits a hydrogen nucleus at a radius of 5.3 × 10−11 m at a speed of 2.2 × 106 m/s. Find the centripetal force acting on the electron. What type of force supplies the centripetal force? I'm not interested in the...

Homework Statement A net charge of 49 mC passes through the cross-sectional area of a wire in 12.0 s (a) What is the current in the wire? _4.1E-3_ A (b) How many electrons pass the cross-sectional area in 1.0 min? ______electrons Homework Equations I=Q/t The Attempt...

Homework Statement Two electrons separated by a large distance are fired directly at each other. The closest approach in this head-on collision is 4.0 * 10-14 m. One electron starts with twice the speed of the other. Assuming there is no deflection from the original path, determine the initial...

Sorry I posted 2 threads within the hour, but I'm just really interested. In my chem class they (teachers, txtbooks, etc.) always mention how electrons "absorb" photons and "jump" to higher energy levels, but when I was reading about QED, renormalization, compton scattering, etc. they talk about...

my textbook says that silicon(Si) has 4 unpaired electrons whereas i think that there are no unpaired electrons in Si as both the p electrons that are present are already paired. could u tell me if i am wrong somewhere?

The information I'm given is: frequency of light: 9X10^14 Hz magnitide of VA 1.3 V (not sure what this is, maybe stopping potential?) It says to simply state the max KE of the electrons so it must be quite simple but I just don't see it. I tried E=hf but this doesn't give max KE. Must have...

Valence electrons of a transition element... Here is the electron config. for Iron (Fe) 1s2 2s2 2p6 3s2 3p6 4s2 3d6. I have two questions about this I've been on for hours... #1 Which subshell (4s or 3d) has the highest subshell? -You can say that the 3d has higher energy because you write...

what is the differece between internal conversion electrons, electron capture and auger electons? i don't understand. The name suggests electron capture and internal conversion electrons are the same thing... but then when i look it up internal conversion electrons seem to be the same as auger...

i was watching the Brian Cox 'night with the stars'. He said that no 2 electrons can have the same energy state. Is this correct? i thought they couldn't have the same quantum numbers but can even share the same orbital (thus same energy). I also thought this applied to the same atom only, but...

Ok I am kinda happy becuase this is my first Post on this website. I love physics. I am wondering if we as humans have established the knowledge of what exactly Protons, Neutrons, and Electrons are. Down to their core, could they be energy? By energy I mean a source of power small or big. I...

Hello there! According to quantum physics, do the electrons have inertial mass? I read somewhere electrons were an amount of energy, with no mass at all. I think I'm confused about the concept of "mass" since I know two, the one they taught me at school, which I'm considering as inertial mass...

Hi guys, This may be a daft question (or set of questions), but I just want to bounce a few ideas off the wall once I understand some simple issues. Can anyone tell me why if you pass a current through a wire in a magnetic field, the wire will move perpendicular to the both the current...

Homework Statement Electrons move to the right in a certain wire. This indicates that: a) the current and electric field both point right b) the current and electric field both point left c) the current points right and the electric field points left d) the current points left and the...

I know that λ=h/p, but how do you find the wavelength of electrons from different quantum levels using the circumference of the electron's orbit?

What causes the attraction between electrons and protons in the nucleus? I've always assumed the attraction and worked from there, but I was curious if anybody knows what the root cause of this attraction is.

Are elemental particles subject to entropy? Are there dead electrons "no spin".

When transition metal start losing electrons they lose them from the s orbital before the d orbital. Why is this? The iron(II) ion has 24 electrons in this configuration: [Ar] 3d6 The neutral chromium atom also has 24 electrons, but in this configuration: [Ar] 3d5 4s1 I understand that...

Homework Statement Write down the electonic configuration for the O atom. Write down the quantum numbers (n,l,m_l,m_s) for each one of the electrons. Homework Equations Pauli exclusion principle. Least energy principle for filling the shells. The Attempt at a Solution...

There aren't any electrons on a neutron star right? They all get squooshed into the protons to make the neutrons. Am I right about that?

Homework Statement I don't really understand the problem wording. What do they ask me exactly? Here it goes: Consider the potential energy V(r) of an electron in an atom whose atomic number is Z. Calculate the potential energy aproximating the distribution of charge of the others Z-1...

Homework Statement Electrons moving initially at 2.4 X 106 m / s in a horizontal direction. They enter a region between two plates of 2 cm in length and are subjected to an acceleration of 4x 1014 m/s2, vertical and pointing upwards. Determine: a) the vertical position of the electrons as...

Homework Statement A beam of 9.5 MeV electrons (gamma = 20) amounting as a current to 0.05 microamperes, is traveling through a vacuum. The transverse dimensions of the beam are less than 1 mm, and there are no positive charges in or near it. (a) In the lab frame, what is approximately the...

Homework Statement Homework Equations The Attempt at a Solution I'm at a loss as to starting the problem. Any help is appreciated!

I was wondering why hot objects glow (such as a heated metal), what I found on wiki: "Thermal radiation is energy emitted by matter as electromagnetic waves due to the pool of thermal energy that all matter possesses that has a temperature above absolute zero. Thermal radiation propagates...

It seems as if the charge we have labelled the electron with has simply been inferred by comparing it to the proton, in which case it is pretty much exactly the opposite, so we give the proton and electron charges of +1 and -1 respectively. This is fine, but when we get to the standard model...

Suppose there are two electrons which are not moving relative to each other. Then in the reference frame of either electron, there is an electrostatic force pushing the two electrons apart, and they will move apart. However, if an observer is in a reference frame moving relative to the...

Homework Statement A potential diffference of V = .497 V is applied across a block of silicon with resistivity 8.75 x 10-4 Ωm. The dimensions of the block are width = a = 2.00 mm, and length L = 14.7 cm. The resistance of the block is 54.1Ω, and the density of charge carries is 1.23x1023 m-3...

Given the following image of 2 conductors, a negatively charged inner ring and positively charged outer ring, taken from http://www.physicsclassroom.com/class/estatics/u8l4d.cfm" Where are the electrons located in the outer ring? If there was no inner ring, and as the outer is...

Please teach me this: Why there are not exist righthanded neutrinos,but exist righthanded electrons in the lepton family? Thank you very much for your kind helping.

when electrons are in their standard orbits , why is it that they don't absorb or radiate energy ??

An initially neutral conductor contains a hollow cavity in which there is a + 65.0 nC point charge. A charged rod transfers - 75.0 nC to the conductor. Afterwards, what are the charges along the inner surface and the exterior surface? I understand that the charges from the rod are equally...

...electrical charge? i've read them described as both. what i want to try to understand is, is the proton and electron simply an electrical charge, nothing more? or, are they things in their own right, which have an electrical charge? to use an analogy. peter can have a cardboard sign...

How do electrons revolve around in molecule bonded by covalent bonds? An electron revolves around one nucleus. But if it is going to be shared by another nucleus(as in covalent bond), then how will the electron revolve? does it go all around both the nucleus? Please explain a little deeply.

the way I am understanding how voltage works is how fast one coulomb is passing a point. so if i push more electrons passed a point, it actually gives it a higher voltage? that and, if i have a screen with a positive potential across it and an electron stream flowing towards it, would the...

Do single non bonding electrons (i.e. on a free radical) always occupy non hybrid orbitals? For example the methyl radical has trigonal planar molecular geometry so the lone electron must occupy a p orbital. Why doesn't it occupy an sp3 orbital instead?

Homework Statement How to couple spin angular momenta of four electrons? 2. The attempt at a solution I've no idea. I've learned coupling of two angular momenta and Clebsch Gordan coefficient. But donno how to appy that to this system.

Homework Statement a) What is the energy of a photon that has a wavelength of 0.10 μm? b) Through approximately what potential difference must electrons be accelerated so that they will exhibit wave nature in passing through an aperture 0.10 μm in diameter? The Attempt at a Solution I've...

hello, to preview chemical bonds must be considered only the electrons in the last sublevel and not the electrons in all the level? for example my book talking of carbon sp hybridation say that we shouldn't expect it make 4 bounds but only 3, why if the carbon need exactly 4 electron to...

i studied that xrays can be produced when a vacancy created ,by knocking of electrons by other high velocity electrons, is filled by other electrons of outer shell. but can electron knock a electron? in same mass collision as in above just velocity is exchanged. so the orbiting electron will...

I have three questions which I have to put into context, much of which is paraphrased from a book by Kerson Huang. In QED, the source of the gauge field (is the gauge field different from the vector potential?) is the current and charge density j, ρ. When a particle (electron) couples to...

Homework Statement "What force keeps the electron from falling into the nucleus of the atom?"Homework Equations The Attempt at a Solution I have three hypotheses: 1. Neutrons have a negative charge (although there is not only electron capture but also b+ decay) 2. The electrons in the...