Electrons Definition and 998 Threads

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 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...

Homework Statement http://dl.dropbox.com/u/305636/yeephysics.jpg If that doesn't work, the problem states: A pair of parallel metal plates, 100mm long and a distance of 20mm apart are set up in an evacuated tube as shown. A potential difference is applied to the plates, creating an...

Hey all, I'm a student curently studying in a Singaporean Junior College (American 12th grade equivalent). I was curious and just thought of the following: Suppose a system with a electron and a proton nucleus, a hydrogen atom. From electrostatic force and circular motion equations- F =...

Greetings, I know that when an electron in an atom emits or absorbs a photon, what changes is the electrons orbit. What about free electrons? If an electrons moving freely through space emits or absorbs an electron, what changes about the electron? And what determines what frequency...

Hi all. I understand that a hole is the absence of an electron. I have come across textbooks with instances where they talk about movement of minority carriers, and movement of majority carriers. Since the hole has to be one of them, they are referring to moving holes. But, how can a hole...

Homework Statement Two electrons are held 1 nm apart and then released. Assuming them to be classical particles, how fast will they be moving when they are far apart? Homework Equations Not sure here really due to the lack of info give in the question. I know the work done would be qV...

Homework Statement suppose you put 5 electrons into an infinite square well. (a) how do the electrons arrange themselves to achieve the lowest total energy? (explain with help of diagram) (b) give an expression for this energy in terms of electron mass, well width L and planks constant The...

A plasma is when electrons become unbound by their atoms. So does that mean that you can get a different plasma for all different types of atoms (like gold plasma and helium plasma)? Also the electrons are not free as they are bound to the plasma (but not individual neuclei) by the magentic...

Homework Statement A helium atom had two electrons in the first shell (1s). Explain, withour detailed derivation, what the value of the total spin quantum number is. Homework Equations ? The Attempt at a Solution Since the 2 electrons are in the first (1s) shell they must have...

why the electron does not stick to the nuclei?

can i empty a wire from its free electron.

Why can you fire neutrons or alpha particles at the nucleus and see interesting nuclear effects but you can't fire electrons at the nucleus? Or can you? I would guess not, otherwise electrons would collapse into the nucleus in every day life. I've heard that doesn't happen because it would...

My understanding of the origin of matter is that it arose from pair production after the big bang. The process leading to electrons also produces an equal number of positrons. The universe now has lots of electrons and essentially no positrons. Since positrons are inherently stable, I presume...

Homework Statement Electrons present in the outermost orbit are valence electrons. If we supply sufficient energy to these electrons they make their transition from valence band to conduction band and electrons in conduction band are termed as conduction electrons. My question is, take for...

Which experiment describes that electrons have same mass and same charge?

Homework Statement You are observing the effects of single point charge with a magnitude of +4.3muC. If a singe electron is placed 10cm to the right of this charge, what is the magnitude and direction of the electric force it will experience?Homework Equations E= Fe/q E= kq/r^2 The Attempt at...

Hello PF, I came across a fact that, tungsten, molybdenum and chromium all have 6 valence electrons. Now,if one uses Molybdenum and Chromium instead of tungsten in photonic crystals for TPV(Thermo PhotoVoltaics) does it mean: 1. All are capable of releasing equal number of photons...

(Since this is a coursework question and not a homework question, I deleted the template) Both my chemistry and physics textbooks cite cathode rays as having the ability to excite or eject electrons from an atom (e.g., dielectric breakdown, x-ray spectroscopy). How can a stream of negatively...

Are there laws forbidding that reaction? Which ones? Thanks

Experimentally how do we make sure that the ejected electrons are coherent?

The question I'm having trouble is: A neon indicator lamp needs 90v to conduct. It then draws out 0.5mA. Calculate the number of electrons moving through the lamp each second. so... Electron Charge - 1.6*10^-19 Voltage - 90 Current - 0.5mA Any sort of help would be helpful!

Why electrons occupy degenerate orbitals with parallel spins? heard something of stability due to exchange pairing of electrons. someone kindly clarify this matter.