Electron Definition and 999 Threads

Homework Statement Homework Equations E = γmc2 p = γmv K = E - mc2 E2 = c2p2 + m2c4 The Attempt at a Solution I have completed most of this question, but I am struggling to get the required result to the final part of the question.[/B]

I have been studying Optical Isomerism recently, and I have got one question, answer to which was not in the books that I have. I have understood what the phenomenon is, and that, how one can determine whether the plane of polarised light is rotated, and how to tell from the structure whether...

What is the value of optical effective electron mass for tin metal (white tin)? What is the value of mean free path for electron of tin metal? At least give me some websites or papers where I can find it?

In the calculation of R=σ(e+e-→hadrons)/σ(e+e-→μ+μ-) from BaBar experimental data at a center of mass energy of √s≈10 GeV i obtain R=5. Theoretically I should get a value of R=10/3. I know it has something to do with the resonances of ϒ mesons shown in the plot attached, but I don't know how to...

Homework Statement When an electron in a hydrogen atom makes a transiton between two levels with prinicipal quantum numbers n1 and n2, light is emitted with wavelength of 658.1 nm. If we assume that the energy levels of the atom are in agreement with the Bohr model, what are n1 and n2...

Hello, I was trying to make a simple model of an electron tunneling through several potential barriers. The electron will flow through a conductor to a heterojunction of possibly semiconductor/oxide layers. I assume the electron is coming as a plane wave from the left with some energy E. We know...

Homework Statement What is the escape speed of an electron launched from the surface of a 1.0-cm-diameter glass sphere that has been charged to 10nC? Homework Equations Given: d= 1.0cm r= 0.05cm= 0.0005m q1 = 10nC = 10 x 10-9 (sphere) q2 = -1.6 x 10-19 (electron) Equation: U = (kq1q2)/r KE=...

Homework Statement A proton is released from rest at the positive plate of a parallel plate capacitor. It crosses the capacitor and reaches the negative plate with a speed of 50,000 m/s. What will be the final speed of an electron released from rest at the negative plate? Homework Equations...

I was studying the spin-orbit interaction and the Zeeman effect, and came across the concept of optically active electrons. Initially I got the idea that an optically active electron is any unpaired electron. But then, while trying to understand the Zeeman effect in a Cadmium atom, for which...

Homework Statement A proton beam is going from north to south and an electron beam is going from south to north, so in which direction is the electron beam deflected Homework EquationsThe Attempt at a Solution . [/B] I thought an electron...

Hi Guys, I have attempted the question below. Please have a look at my work and let me know if everything looks fine. Any feedback would be great. 1. Homework Statement Homework Equations F = qv/d a = F/m t = d/v qv = 1/2mv^2 x = vt + 1/2 at^2 The Attempt at a Solution

Homework Statement An electron acquires 3.16*10^-16 J of kinetic energy when it is accelerated by an electric field from plate A to plate B. What is the potential difference between the plates, and which plate is at the higher potential. Homework Equations w =Δv * q The Attempt at a Solution...

Homework Statement A single electron atom has the outer electron in a 4f1 excited state. Write down the orbital and spin angular momentum quantum numbers and the associated magnetic quantum numbers for this state. Homework Equations I don't think there is any relevant equations. I think it...

Homework Statement Homework Equations E=hc/lamda The Attempt at a Solution I can get the amount of energy incident on the surface (3%of Intensity×Area) What will be the energy required to make 1 electron escape? (4.5eV+hc/250nm )? Then I divide total energy by energy to make 1 electron...

Homework Statement How to calculate the probability of finding an 1s electron within 1 picometer cubic region located 50pm from the nucleus. Homework Equations The probability of an 1s electron within a spherical volume of radius 'a' from nucleus can be find using the expression...

Which is more correct, teaching the first two valence electrons as paired in the electron dot structure or teaching them as not pairing until forced.

Homework Statement In a certain region of space, there is a uniform electric field, E = 4.28 x 104 V/m directed due east, and a uniform magnetic field B = 0.071 T, also directed due east. What is the magnitude of the electromagnetic force on an electron moving due south with a velocity of 3.09...

Homework Statement A 191Os nucleus decays via β- emission to an excited state of 191Ir at 171 keV. What is the maximum kinetic energy of the electron on the β spectrum? a) 0.134 MeV b) 0.143 MeV c) 0.171 MeV d) 1.859 MeV Homework Equations 191 Os = 190.960928u 191 Ir = 190.960591u...

The electron gyromagnetic ratio of 1.0011596522 is computed using perturbation method and Feynman diagrams that is said to produce a value to better than one part in 10^10, or about three parts in 100 billion. Does the nonperturbative lattice QFT also able to compute it? What is the counterpart...

Hello, I was wondering if it would be possible to eject chemical compounds from a sample, say like a biological tissue, using an electron beam. I know that electron scattering is one product of electron-specimen interaction, and that's the principle behind electron microscopy, but I'm more...

Homework Statement (a) What voltage will accelerate electrons to a speed of ##6.00 \times 10^{-7} m/s## ? (b) Find the radius of curvature of the path of a proton accelerated through this potential in a 0.500-T field and compare this with the radius of curvature of an electron accelerated...

Hi, I need to calculate the current in a 400nm piece of graphene. Can some one help me please? I found online that graphene has electron mobility of 200,000 cm^2/( V s). My best attempt is as follows. Using the equation vd = uE where E is the magnitude of the electric field applied to a...

Homework Statement Here's the pic of the problem and my work The Attempt at a Solution I'm not sure how I'm suppose to calculate the energy change? Did i do it correctly in the picture? For number 9, I just added IE1 and IE2 and subtracted EA1 to get a total of 3200.3. This means that the...

Do electron antineutrinos interact with anything?

Hello, Chromatin in the living cell is divided into Heterochromatin and Euchromatin. My book states that the Heterochromatin, when examined by the electronic microscope, is electron dense, and the Euchromatin is electron-lucent. I don't understand any of the concepts in bold. And I would...

Homework Statement An electron is fired from x = 0 with an unknown V0 at 45 degs to the horizontal between two parallel plates separated by 2 cm. Electric field is 103 j N/C. Find: a) The max value of V0 so that the electrons don’t hit the upper plate 3.75 * 106 m/sHomework Equations If you...

If two electrons are far apart, the antisymmetrization part in the probability amplitude for position is negligible and they behave as classical particles, thus we don't need to consider antisymmetrization. My question is why is this also true when we have a large number of electrons, say...

Homework Statement For the hydrogen atom in the first excited state, find the probability of finding the electron in a classically forbidden region. Homework Equations E1 = -Z2μe'4/2n2ħ2 ψ200 = ∫ψ(r)2dr from the limit to ∞ The Attempt at a Solution https://imgur.com/a/fWIMq I feel like this...

Homework Statement An electron enters a region between two large parallel plates made of aluminum separated by a distance of 2.0 cm and kept at a potential difference of 200 V. The electron enters through a small hole in the negative plate and moves toward the positive plate. At the time the...

When radiation of frequency less than threshold frequency falls on a surface of metal, it gives energy to the electron and at a instant later another radiation of same frequency strikes the same electron, if the energy of two photon equals or is greater than the work function of the electron in...

Hi, I just have a few questions I'm struggling to find straightforward answers to online. The 4 quantum numbers of an electron in an atom describe the energy level, shape and suborbital of the orbital, and the fourth assigns a value to the electron's spin. Question 1) why is it in lone atoms...

Imagine attaching electrodes to a complex sample, e.g. a semi-conductor or a single chemical molecule, leading to some electric current. Can we decompose this electron flow into local flows? - like locally attaching amperometer and counting what fraction of electrons flow directly between given...

If you were sending microwaves one direction to ionize a gas, would you be able to pull or separate the atoms from these directionalized electrons? Say you had a magnetic coil with a strong e field pulling the atoms one way while the microwaves were trying to push the electrons the other way-is...

Hi! In school I was thaught that magnet doesn't have anything to do with the motion of electrons, but then when you see the way electromagnetic induction work, it seems like the magnet move the electrons somehow. How is that possible and can we control the movement? Thanks a lot and sorry for my...

Does electron really vibrate to produce heat energy or is it atom in whole to produce heat?

The quantum physicists claim, that an electron has been 'smeared out' in the space around the nucleus. So it seems an electron in the atom is present everywhere at once. Is the next interpretation acceptable? The electron moves with many km/s in an extremely small space. In photography it...

I'm studying for a qualifying exam and I see something very strange in the answer key to one of the problems from a past qualifying exam. It appears the sigma^2 for a two electron system has eigenvalues according to the picture below of 4s(s+1) while from my understand of Sakurai it should have...

Homework Statement Hi guys, I'm currently writing an extended essay in Physics looking at the effect of percentage composition of Sn has on the electrical resistivity of SnPb Solder. I've noticed that Sn is listed as being a better conductor than Pb, despite trends of periodicity and have been...

I was having a casual conversation with my uncle the other day and he basically told me that electron is a field. Essentially he claimed that there is an electron field that encompasses the whole universe (like the Higgs field) and what we think of as an "electron particle" is just a fixed point...

1)Is the wave function of the electron perpendicular to the motion of electron in straight line in the similar fashion as that of the photons.? 2) And what is the origin of this wave function? 3) can someone give me the details about the electron in double slit experiment (and mainly a theory...

I was trying to help (elsewhere) a student with some QM related problem and I realized something. When discussing QM we underline the fact that electron doesn't behave as a particle, it behaves as a wave. Yet when we explain wave function we say something like "square of the wave function is a...

Homework Statement What is the force on an electron with a velocity v = (2i – 3j) Mms-1 in a magnetic field B = (0.8i + 0.6j – 0.4k) T Homework Equations F=qvBsinθ The Attempt at a Solution using cross product I got: (1.92i + 1.28j + 5.77k)10^-13 N which is the listed correct answer. My...

Hello! How do I find how much energy does electron radiate during one revolution if the energy radiation rate is given by Larmor Formula: dE /dt = [(− 2/3)* e2* a2]/ c3. Should I use the chain rule? At the moment I only want a hint how to solve this. With best regards

I have this brain worm and it's been bugging me for ages. I don't know enough about anything to be able to answer this but when I heard a theory that an electron can be in 2 places at once but then appears to be in a specific location when observed I started wondering how this could be possible...

Firstly sorry for my english . I don't know how i should search this question this is why i am asking here. while i am thinking about charges,i think consider a positive charge. And put an electron very far from it. Is there any posiblity for electron don't affect from positive charge

Why is the number of doping unrelated to the amount of current produced by solar cells? Suppose GaAs and Ge with the same amount of doping. Where is the role of an electron generated by the donor?

Consider hydrogen and helium. Both have electrons in energy level 1. When the electrons move from level 1 to a higher level, are the energy quantum the same for the electrons in hydrogen as in helium? If so, then how can one distinguish hydrogen from helium by observing the emitted light...

I've read that if you apply enough voltage to the plate of certain types of tubes, they will generate a fairly good amount of X-rays (even more so if the cathode is hot) -- I even read about a guy who managed to take relatively detailed radiographs of random objects using a standard...

After an electron absorbs a photon, it will move to a higher energy state. It then releases a photon and returns to its ground state. But why does the electron release the photon? Why does it not remain in that energy state? What forces it to return to ground state?

Yeah, where does it comes from?