State Definition and 1000 Threads

Homework Statement Find the Equation of State of a fluid with Volume expansivity ##\alpha_P## and an isothermal compresibility ##\kappa_T## are given by $$\alpha_P=\alpha_0 \Big(1-\frac{P}{P_0}\Big) \\ \: \: \: \: \kappa_T=\kappa_0[1+\beta_0(T-T_0)]$$ ¿ What conditions should the constants...

Hi there, I am new to electron theory, and have a question regarding fermi energy. The book I am reading plots the Fermi energy distribuiton function vs Energy for T=0 ( upper right graph in pcture) and for T not equal to zero. The book says that, when T does not equal zero, the decrease in the...

hello, i am looking for a book named "solid state physics: problems and solution" by mihaly and martin. 2nd edition. can anyone please help

Notation: ##J^p## - ##J## the total angular momentum, ##p## the parity = ##+## or ## -. ## Ok so I'm given a diagram of energy levels, all have a ground state of ##0+##, except one which has a ground state of ##1+##. I'm askeed to indentify which set of energy levels belong to which nucleus...

In Griffith books of introduction to QM, it say that Quantum State, mathematically represented as a vector. My problem is with understanding what are the components of such a vector. Do I understand it correctly, that, say, in case of a particle in a box, Quantum State, as a vector is a...

So I've just recently started learning path integral methods in QFT and string theory, and I've heard from numerous sources that the path integral (specifically fermionic path integrals, perhaps?) are objects which are not at all on solid mathematical ground. The feeling I get is that perhaps...

Hi Physics Forums! The ground state electron is the largest negative value, but what does this mean? Does this mean that kinetic energy is a positive value above zero? It seems at the ground state, the electron might also have kinetic energy as it is moving around as well as potential...

Homework Statement https://fbcdn-sphotos-c-a.akamaihd.net/hphotos-ak-xpf1/v/t1.0-9/10980752_10204928958360361_5256945004598578166_n.jpg?oh=7fd9defb14be9a9befa0cf5032def429&oe=55576A2C&__gda__=1431534931_425423ae11039486a001b049726e1b11 Homework Equations Charles Kittel's book on Solid State...

I'm having trouble figuring out how to derive a Hamiltonian for a three state system. I know how to for two state system but for a three state I don't know what vectors I could use to derive the operator. Could someone explain how to do it and give a link to somewhere I read about it

Hey guys, I'm very new to quantum mechanics and have purchased 'Quantum Mechanics: The Theoretical Minimum. I'm still a bit confused by a fairly fundamental idea. In the book, it states that you first prepare a spin state (say the σz = +1) in the initial measurement. If you rotate the...

Our hard drives are reaching the limit of memory capacity and they are studying about the idea of using the molecules and atoms to store memories. Can information or memories be stored in the quantum state? When we heard of quantum state applications in computer, we mostly think about quantum...

QM students study the singlet state, (|u>-|d>)/SQRT(2). Particles in the singlet state can be separated by any distance, and remain in the singlet state. That leads to the EPR paradox, Bell's Theorem and the more. My question has more to do with entering the singlet state. Leonard Susskind...

Homework Statement Consider a particle with mass m in the following 1D potential: V(x)=\left\{ \begin{array}{lr} mgx \ \ \ x>0 \\ \infty \ \ \ \ \ \ \ x\leq 0 \end{array} \right. What is its minimum energy calculated using the uncertainty relation? Homework Equations \Delta x \Delta p...

Homework Statement It's just that in my textbook, for section titled "Second virial coefficients can be used to determine intermolecular potentials," I have an equation that I do NOT understand how it was derived---I tried to do it over and over, but couldn't quite figure how. If anyone could...

Hello All, I am pretty sure that when a nucleus decays via e.c. and goes to the ground state all of the excess energy is released with the emission of the neutrino but was wondering if anyone could confirm/give a reference for this. Thanks!

New York Assembly speaker charged with five criminal counts in corruption case http://news.yahoo.com/york-assembly-speaker-charged-five-criminal-counts-corruption-145959633--sector.html Of course, NY State is equal opportunity in these matters. Joe Bruno, was the Temporary President of the...

Homework Statement Show the following where Homework Equations The Attempt at a Solution

Can anyone please recommend sources for questions and problems with soultions related to Solid State Physics I course. For all range of topics from crystal structures up to semiconductors introduction (by Kittel). Thank you.

Suppose one scientist performs a series of experiments, and another scientist does the same thing. But unbeknown to either of them, a highly evolved alien measures all of the particles the first scientist is going to test, just before he does his measurements. Question: Would the two...

Homework Statement Given an hamiltonian with , find the average energy in the microcanonical ensemble. Homework EquationsThe Attempt at a Solution [/B] Can you please tell me whether the following developpement is correct or not? Thank you.

Homework Statement In the circuit shown the 120V, 60Hz source supplies the ideal load shown through an ideal 2:1 transformer. What steady state current would you expect to read on the rms ammeter shown (please find the picture attached)? Homework Equations Zeq = (1/Z1+ 1/Z2)^-1 Z1 =...

Dear all, periodic DFT codes (e.g. VASP) effectively simulate an infinite crystal due to the periodic boundary conditions. However, the energy value that one obtaines at the end of a simulation if finite. Frankly, I'm quite confused right now. Is the energy to be understood 'per unit cell'...

Homework Statement For a stretched rubber band, it is observed experimentally that the tension f is proportional to the temperature T if the length L is held constant. Show that: a) The internal energy U is a function of temperature only b) Adiabatic stretching of the band results in an...

Hi. I plan on being an exchange student at Berkeley next year. I cannot find any course description for this course, I only find the description for 141A+141B: http://general-catalog.berkeley.edu/catalog/gcc_list_crse_req?p_dept_name=Physics&p_dept_cd=PHYSICS 141A. Solid State Physics. (4)...

Homework Statement 8.02 × 10−1 moles of nitrogen gas ( γ= 1.40) is contained in a volume of 2.00 × 10−2 m3 at a pressure of 1.00 × 105 Pa and temperature of 300 K. The sample is adiabatically compressed to half its original volume. IT behaves as an ideal gas. (i) What is the change in...

Hi All, I'm in the beginning stages of writing a quantum computer emulator, primarily to get all the concepts down. I've got an excellent Bloch sphere with a Bloch vector that I can duplicate as many times as I like. However, I'm now tackling entangled states. I'm struggling with identifying...

Homework Statement (a)Find energy of photon emitted (b)Show that relative velocities after de-excitation are reversed (c)Find an expression for CM frame energy and find momentum of either particle in CM frame (d)Consider now, for a nuclear process and describe the initial and final conditions...

"Let’s begin by labeling the possible spin states along the three coordinate axes. If A is oriented along the z axis, the two possible states that can be prepared correspond to σz= ±1. Let’s call them up and down and denote them by ket-vectors |u> and |d> . Thus, when the apparatus is oriented...

can anyone suggest any good reading material on operator state mapping in conformal field theory? I know only elementary field theory... So it might be helpful ifsomeone suggest a book where it is done in little detailed way..

I would like to know what is the difference between a solid state physicist and a materials engineer. I mean, do they end up doing the same kind of job or research? If they both have the same purpose, how can they do it having different backgrounds? Which preparation is better for the purpose?

1 what are the various methods/ways, besides quantum entanglement, to put, some of, the photon properties an indeterminate state? 2 what are the various methods/ways, besides polarizers or measurement, to put the photon properties a determinate state?

Mario Cuomo died of heart failure at his home surrounded by family members. http://news.yahoo.com/mario-cuomo--former-new-york-governor--dies-at-age-of-82--reports-010630131.html My condolences to his family, friends and colleagues.

Homework Statement Consider a one-dimentional particle in a box with infinite potential walls at x=0 and x=L. Employ the variational method with the trial wave function ΨT(x) = sin(ax+b) and variational parameters a,b>0 to estimate the ground state energy by minimising the expression E_{T}=...

How does the balanced chemical equation tell us the products are in which state? Solid, Liquid, or Gas or aqueous?

Several recent arxiv articles like http://arxiv.org/abs/1409.6290/ reviewing the pbr theorem http://arxiv.org/abs/1111.3328/ got me thinking about this again with respect to straightforward two-slit interference, which I'd thought simply and unambiguously resolved the issue in favor of "it's...

My goal is to use a single signal to do two things at the same time...when DC signal is applied turn transistor1 off and turn transistor2 on. Then when signal is not applied transistor1 returns to on and transistor2 returns to off. Frequency will be no more than 60Hz. What would this circuit...

Often ignored, but turned out to be a problem when trying to compute the commutator of position and spin. Pauli matrices clearly acting on two dimensional vectors while position on infinite dimensional vectors. But a system is described as a single state vector in Dirac notation. A system can of...

Say you have a flat resistor that is producing heat. You place the resistor against a sheet of steel and wait for equilibrium. One side of the steel is now at the same temperature as the resistor (assuming negligible contact resistance), the other free-air side of the steel is at a lower...

I'm helping write some supplementary notes for an undergraduate GR class at my university. I'm writing about the equivalence principle, do you find this way of stating matters acceptable? The equivalence principle as stated by Einstein asserts that in a sufficiently small vicinity of an event...

I know there were some discussions in the forum about fock state. In text, fock state described as a state with fixed number of particle but unpredictable phase. Instead of talking about the math, could anyone show me a clear picture from physical point of view what is fock state? In the phase...

I am trying to calculate the steady state error of the following system but unable to do it. I have used MATLAB and calculated the steady state error to be 0.1128 but don't understand the steps that I need to do to calculate this. Please help. Thanks

Hey, I'm having some trouble understanding why the energy changes here between the blue and red paths (see attached image), it's representing state of an electron in a square lattice crystal. Like mathematically I can see it because obviously plug and chugging the different values k in E(k)...

I've started few days ago to study quantum physics, and there's a thing which isn't clear to me. I know that a quantum state is represented by a ray in a Hilbert space (so that ##k \left| X \right\rangle## is the same state of ##\left| X \right\rangle##). Suppose now to have these three states...

why isn't solution state a true physical state but a pseudo state?

I would like to find the distance that a vehicle travels using a Kalman filter. The vehicle is a car that travels the road between two positions. The vehicle has a GPS/barometer/accelerometer device that collects position data, which I converted from a longitude and latitude to a North, East...

Another theorem ruling out ψ-epistemic models: http://arxiv.org/pdf/1412.0669.pdf

I want to get the distance between points. I have a measurement of latitude, longitude and height from GPS/barometer systen (which I converted into north east down coordinates) and I have another measurement of the vehicle's velocity in the north east and down direction. To find the distance, I...

Homework Statement A particle in harmonic potential $$H=\hbar \omega (a^\dagger a+1/2)$$ is at ##t=0## in coherent state $$a|\psi>=2|\psi>$$ a) Calculate expected value of energy and it's uncertainty at ##t=0## b) With what probability do we at ##t=0## measure the energy less than ##3\hbar...

Homework Statement A paticle in one-dimensional harmonic potential $$H=\frac{p^2}{2m}+\frac 1 2 kx^2$$ is at tme ##t=0## in squeeze state for which we know $$(z\frac{x}{x_0}+i\frac{p}{p_0})|\psi >=0$$ where ##z\in \mathbb{C}## so that ##Re(z)>0##, ##x_0=\sqrt{\frac{\hbar }{m\omega }}##...

Hi guys! Suppose there's a particle in a box, initially in its ground state. Suppose that one chooses a system of coordinates such that the potential V(x) is 0 from 0 to L. Suppose that one suddenly perturbate the system at a particular time so that V(x) becomes 0 from 0 to 2L. I've calculated...