(a)
To show: The wave length of a
(b)
What happens to its wavelength if the particle moves into the region of increasing potential energy.
(b)
What happens to its wavelength if the particle moves into the region of increasing potential energy.
(c)
The wavelength at classical turning point.
(d)
To show: That the WKB condition for an allowed bound state energy can be written as
(e)
To show: That Energy for particle in a box with infinite potential walls at and
(f)
The integral
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Chapter 40 Solutions
University Physics with Modern Physics (14th Edition)
- Problem 4. Consider two indistinguishable, noninteracting spin-1/2 fermions in a one- dimensional infinite square well potential of length L. (a) What is the ground-state energy of the two-particle system? (b) What is the ground-state quantum state vector? (c) What is the first excited state energy of the two-particle system? (d) What are the quantum state vectors of the first excited state? (e) What is the degeneracy of the first excited state? (f) Discuss qualitatively how the excited-state energies change if we consider the particles to be interacting through the Coulomb potential.arrow_forwardPROBLEM 2. Calculate the probabilities of measurement of different mo- menta p for a particle with the wave function (x) = Ceka sin (gx), %3D where C is a normalization constant.arrow_forwardSketch the potential energy function of an electron in a hydrogen atom, (a) What is the value of this function at r=0 ? in the limit that r=? (b) What is unreasonable or inconsistent with the former result?arrow_forward
- Assume that an electron is confined in a one-dimensional quantum well with infinite walls, draw the wave functions for the first 3 levels, ψ1, ψ2, ψ3. Also, show the probability density functions corresponding to these three levels?arrow_forwardGive COMPLETE solution. Topic: Grand canonical ensembe (Statistical Physics)arrow_forwardConsider a three-dimensional infinite potential well with a quantized energy of Enn,n, %3D (n + ng + n). where n = 1,2,3, ..,n, = 1,2,3, .., n, = 1,2,3, and a represents the 2ma potential well width in the x, y, and z directions. i. The lowest energy level that the electron may occupy is ii. The values of (ng, ny, ng) for the next higher energy level that is above the lowest energy level can be iii. If the electron drops from the energy level in item (ii) to the energy level in item (i), what is the wavelength of a photon that may be emitted if the work function is 0.4 V? Assume a=0.1 iv. Let the wave function has the general form Y(x,y, z) Asin nyy sin sin The value of A would be, v. Let (n, = 2, n, = 2,n, = 2). What is the probability that an electron exists in the intervals Osxs 0sys and o s z s?arrow_forward
- Question A2 Consider an infinite square well of width L, with V = 0 in the region -L/2 < x < L/2 and V → ∞ everywhere else. For this system: a) Write down and solve the time-independent Schrödinger equation for & inside the well, where -L/2< xarrow_forwarda) For a particle in a one-dimensional box of length L, do the energy levels move up ordown if the box gets longer? Explain your answer clearly.b) Consider a particle in a two-dimensional box of side lengths a and b, where b = 2a.In which direction is it more expensive (in terms of energy) to add nodes? Explain youranswer clearly.c) Consider a particle in a two-dimensional box of side lengths a and b, where b = 2a.Write down the quantum numbers corresponding to the rst (lowest) 5 energy levels of thissystem. Note any degeneracies.arrow_forwardPhysics Use qualitative arguments based on the equation of Schrödinger to sketch wave functions in states with energies E1 < Vd and E2 > Vd at the potential shown in the figure below. Detail: in regions x < 0 and x > b the potential V(x) is very large. Justify your answers in detail for each region.arrow_forward1. a. Identify the three characteristics of Separable Solutions. b. Explain each of the characteristic of Separable Solution. (You can refer to Introduction of Quantum Mechanics by Griffiths. You can find this on Chapter 2 of the book but I'm quite confused with the calculus details and the identified characteristics. Hope you can answer it though! The separable solutions I'm talking about here is the one used in obtaining Time Dependent Schrodinger Equation.)arrow_forward= (6), where Ig) is A particular two-level quantum system has two eigenstates given by lg) := (9) and Je) := the ground state and Je) is the excited state. The Hamiltonian operator is given by A - (::) %3D O A a. Write down the density matrix and calculate for the partition function. b. Calculate for the mean energy of the system. c. Calculate for the expectation value of the operator ô = (;:). %3D 0 -arrow_forwardPROBLEM 2. Consider a spherical potential well of radius R and depth Uo, so that the potential is U(r) = -Uo at r R. Calculate the minimum value of Uc for which the well can trap a particle with l = 0. This means that SE at Uo > Uc has at least one bound ground state at l = 0 and E < 0. At Ug = Uc the bound state disappears.arrow_forwardarrow_back_iosSEE MORE QUESTIONSarrow_forward_ios
- Modern PhysicsPhysicsISBN:9781111794378Author:Raymond A. Serway, Clement J. Moses, Curt A. MoyerPublisher:Cengage LearningPhysics for Scientists and Engineers with Modern ...PhysicsISBN:9781337553292Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningUniversity Physics Volume 3PhysicsISBN:9781938168185Author:William Moebs, Jeff SannyPublisher:OpenStax