Electrons Definition and 998 Threads

Light consist of photons but also has a wave nature which consists of electric and magnetic waves right? So when another particle moves, say electron it also shows wave nature according do debroglie. Will it also have electric and magnetic fields? Or is it just this special photon which has...

I got a Geiger-Muller counter, and a radioactive source. The source is a Sr-90/Y-90 source, which emits highly energetic electrons, the highest energy is around 0.98c. The space between the source and counter is approximately 10 cm. I am not operating in vacuum! The assignment I am doing is...

Why is it that atoms must have 8 valence electrons in order to be stable? Aren't electrons most stable when the orbital is completely filled? Helium's electron configuration is 1s^2, Neon's is 1s^2 2s^2 2p^6, etc. All the noble gases, except for helium, have the p orbital filled. I'm...

My thought experiment is this: The slit experiment showing photons are particles and waves leaves out a constant that is wrong. c in a vacuum is 187kph because vacuum is a medium. c is infinite in true nothing. Our sample time of an electron Thus gives probabilities not definates...

Homework Statement Explain what is meant by Bremsstrahlung. Which cross-section is higher for atoms with Z>1: Bremsstrahlung on the atomic nucleus or on the atomic electrons? Why? The Attempt at a Solution I explained what Bremsstrahlung was just by copying from the notes. I am not...

Homework Statement Why is electron movement through a loop wire considered not an accelerated motion? If it is how come "an electric current flowing in a loop of superconducting wire can persist indefinitely with no power source" (Wiki)?

How do ions allow the transfer of electrons through a solution?

An exact energy level is required to bring an electron from one orbital to another. For example with hydrogen, for an electron to go from the ground state to the third orbital requires a photon with an energy of 12.09eV. But what is the tolerance? In other words, how close to that frequency...

Hello! So I'm trying to explain dah electron configuration to my little sis... quick answer will be appreciated! do they bounce off due to same charge repelling? thanks :)

Homework Statement Determine the threshold energy for electrons to produce Cerenkov radiation in glass (refractive index n=1.52). The Attempt at a Solution The only equations given in my notes are: cos \theta_{C}=1/\betan for \beta>1/n and...

Hello, everyone: My question is about the states of paired electrons in BCS Theory. According to Tinkham's book (pages 70-71), electron states in the superconducting gap (SG) in normal state are push up to above the upper edge of the SG in superconducting state; on the other hand, it seems...

Does molecular vibrational transition and consequent emission of infrared radiation involve electrons changing energy level? In wikipedia, about vibronic transitions it says "Most processes leading to the absorption and emission of visible light, are due to vibronic transitions. This may be...

Homework Statement How far apart must two electrons be placed on the Earth's surface for there to be an electrostatic force between them equal to the weight of one of the electrons? Homework Equations Fe = (1 / 4∏ε0) X (q1q2 / r^2) The Attempt at a Solution I set Fe = me-...

Homework Statement Hi. :) I'm supposed to balance the formula and write the values. Cr3++CIO3-+H2O → Cr2O72-+Cl-+H+ Specify:Amount of electrons and: Charges The Attempt at a Solution I don't really got any clue. Please help! Cr3+ have +3 The oxygen have -2 and then? Cr3++CIO3-+H2O →...

I know that magnetic fields can effect electrons in certain ways, but I specifically want to know if a bar magnet just sitting on a desk will attract "free electrons" much like a magnet will attract a paperclip. The reason for this question is my brother is working on a new type of battery that...

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 2. Determine the concentration of valence electrons in doped (a) Si (a = 0.543 nm) (b) GaAs (a = 0.565 nm) Homework Equations ? The Attempt at a Solution This is the problem, I don't really know what they're looking for. I know what valence electrons are, but...

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...

Heres the Monsanto process: I can't figure out how to determine the electron count for these rhodium complexes. Starting with the one at the top. Heres how I count its electrons: rhodium is a group 9 element so it has 2s electrons and 7d electrons which means it has 9 out of 18 valence...

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...

Homework Statement When a returning spacecraft re-enters the atmosphere, the shock wave and the friction that it generates lead to the ionisation of gas molecules just ahead of it and around it. Because of this, during the most intense phase of deceleration, radio communication signals...

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!