Electrons Definition and 998 Threads

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...

I'm having a play around with a simple radiation detector that has 2 electrodes with a slab of uniformly doped silicon in between. I'd like to know the bias voltage i would need to apply across the electrodes so that the silicon slab is just depleted of electrons (i.e so that positive charge...

Homework Statement Using Equations (A) and (B) explain how to obtain for e/m from the slope of an I vs. \sqrt{V}/{r} graph. Show how to calculate a value for the Earth's magnetic field BE using the intercept of the graph.Homework Equations (A) B_H = \frac{8NI \mu_0}{R \sqrt{125}} (B)...

...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...

Hey guys, I have a couple of questions regarding X-rays and how they are produced. 1) Is an X-ray an electromagnetic wave or a photon? 2) Why is it that when the electrons collide with the anode in an x-ray tube, X-rays are emitted and not any other electromagnetic wave/photon? 3) When the...

Homework Statement A neutral object contains an equal number of positive and negative charges. A particular neutral object contains 7.2e26 electrons. If 9.5e6 electrons are removed, what percentage of the electrons where removed? Homework Equations coulomb = 6.24e18 electrons elentary...

Hey, In x-ray tubes, how come an increase in the voltage results in an increase in the intensity of the electrons. i.e. the no. of electrons emitted per unit time per unit second. Thanks.

Feel free to answer any subset. I'm not a science person, so apologies in advance for some of the absurdity. 1. When heat up some piece of matter (e.g., a rock), do the the electrons (of the atoms of which the rock is composed of) start moving faster? If so, then why do we observe temperature...

I've been exposed to two different interpretations of the uncertainty principle. 1) If an electron is in a certain state, a measurement of its position will yield a definite result. However, if after the measurement the electron could be returned to the same state, then a repeated measurement...

"Where" do electrons "go"(?) within a covalent bond If you take a water molecule (H-O-H) with 2 covalent bonds (imagine, just for now, that this is the only 2 atoms around ;-). The H’s electron and one of the O’s electrons (within the covalent bond) must be “somewhere”. They were...

Why don't electrons move only along the surface of orbitals? Moreover, how do electrons move within orbitals, random movement or do they follow a definite path? In a p-orbital, does one lobe consist of only one electron? Why is the p-orbital dumbbell shaped and not spherical?

Homework Statement I am trying to retake an old course in statistical mechanics but run into integrals that i simply have forgotten how to solve. Given an denstiry of states such that f(\epsilon)= \frac{1}{|\epsilon |} for \epsilon_{min} \leq \epsilon < 0 and 0 elsewhere Using the mean...

Homework Statement An alien civilization has crossed the galaxy to invade the Earth and enslave humanity, again. Their attacks have been successful so far because their assault troops are equipped with handheld weapons that project beams of charged particles (protons & electrons) at very...

Hi Thinking of the structure of an atom in terms of spherical harmonics; the mathematics of which is the base of schrodinger's wave equation. If its possible to make the electrons gather at the antinodes, what are the possible applications/uses of this? (Simply a new area for research? or...

This question is pretty straightforward, but I just can't seem to find the answer.. What is the reason that electrons only exist in shells and never between them? A hint that was given to me was to "think about quantum energy". I was thinking because if they wouldn't exist in shells, then...

For a simple network of resistive circuit, we can compute the values of current and voltages right? However, I'm more curious about how each individual component behave. Is it possible to somehow isolate each resistor and compute their values individually (e.g. not having to compute the entire...

When electrons gain enough energy to move out to a higher energy orbit then back to their ground state, why do they release a photon? Also, what exactly is 'electromagnetic' about light?

Homework Statement A beam of electrons, with kinetic energy of 500eV, enters mid-way into the space between two oppositely charged parallel plates with a potential difference of 100V Homework Equations Determine the velocity of the electrons The Attempt at a Solution KE=0.5mv^2...

Homework Statement A wire carries a current of 2.0 A for 1.0 hour. How many electrons pass a point in the wire in this time? A 1.2 x 10-15 B 7.2 x 103 C 1.3 x 1019 D 4.5 x 1022Homework Equations Q=I/tThe Attempt at a Solution Q=2(60)=120 number of electrons= 120/1.60217733 × 10-19= but the...

How do you calculate the maximum number of electrons with principal quantum number: a) 1 b) 2 There is more, but I list two because I want to learn how to do it. How do you show your work mathematically and what is is the principal quantum number?

Quantum mechanics and electrons... Can anyone explain according to QM why do electrons move around nucleus...? And how does QM explain electrons' orbit or electron cloud...?...

Energy of electrons... Okay...sorry for such a long post...please be patient... And help me...here i have a question about the electrons' energy in an atom...in every energy level all the electrons contain same amount of energy...but among different energy levels the amount is different...my...

In trying to understand electricity I thought of the following: If I set up a wire one light year long, stretching out into space ½ a light year out and ½ a light year back, and connected a series of light bulbs all the way around the wire, and then connected a battery (large enough to handle...

Where do the electrons that electromagnetic induction mobilizes come from? If electrons are waves as the double-slit experiment demonstrates, couldn't they be generated just as mechanical and light waves are generated?

Latley, I have been doing some internet surfing on the release of electrons from their obit of an atom. I just have a few questions. What is it called when electrons are released from their orbit? How much energy does it take? What are the diffrent ways electrons can be released?

A question in ExamKrackers asks us why triphenylmethanol is so acidic. Link to the structure below: http://en.wikipedia.org/wiki/Triphenylmethanol Explanation: I'm not seeing how the lone pairs on the Oxygen could donate into any of the rings though. It can't donate those electrons onto the...

Hi all, I would like to know what is the relation between charge and mass (of electron/proton/neutron). How far their masses involve in force that exists between them ?

It is a bit more logical that no more than two electrons can occupy the same position in space, however the Pauli Exclusion principle also concludes that no state exists with more than two electrons having the same momentum. Even the state of the entire universe. How is this physically...

Hello, I am a student in Physics and I have some problems to understand how photons and electrons are studied. Is there the assumption that they occupy a so little space in the "Phase space" that they can be considered has point ? Can we expect that in the real case when they "moove" they are...

Spin orbit coupling accounts for the relative motion of a magnetic moment interacting with an electric field. Is there a direct coupling of the magnetic moments of, say, the electrons in an atom as well? Does a magnetic field emanate from spin 1/2 particles in general? Thank you for...

Hello. I used discrete electron multiplier (dynodes) for positive ions detection, and it works fine. Now I want to use it for electrons detection with no changes in mode of connecting power supply (-2 kV on 1st dynode, 0 V on last one) . In the past application I don't use the reflector...

Assume that in an imaginary space there are only two electrons. Now if we spin one of those around itself, without moving its pivot , what would happen to the other one?(I think it would keep moving normally because if it starts turning around the first electron it means we can have "smaller...