Introduction To Quantum Mechanics
3rd Edition
ISBN: 9781107189638
Author: Griffiths, David J., Schroeter, Darrell F.
Publisher: Cambridge University Press
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Question
Chapter 2.2, Problem 2.9P
To determine
The expectation value of
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Write down the equations and the associated boundary conditions for
solving particle in a 1-D box of dimension L with a finite potential
well, i.e., the potential energy U is zero inside the box, but finite
outside the box. Specifically, U = U₁ for x L. Assuming that particle's energy E is less
than U, what form do the solutions take? Without solving the
problem (feel free to give it a try though), qualitatively compare with
the case with infinitely hard walls by sketching the differences in
wave functions and probability densities and describing the changes
in particle momenta and energy levels (e.g., increasing or decreasing
and why), for a given quantum number.
Question related to Quantum Mechanics : Problem 2.21
Consider the function
v(1,2) =(
[1s(1) 3s(2) + 3s(1) 1s(2)]
[x(1) B(2) + B(1) a(2)]
Which of the following statements is incorrect concerning p(1,2) ?
a.
W(1,2) is normalized.
Ob.
The function W(1,2) is symmetric with respect to the exchange of the space and the spin coordinates of the two electrons.
OC.
y(1,2) is an eigenfunction of the reference (or zero-order) Hamiltonian (in which the electron-electron repulsion term is ignored) of Li with
eigenvalue = -5 hartree.
d.
The function y(1,2) is an acceptable wave function to describe the properties of one of the excited states of Lit.
Oe.
The function 4(1,2) is an eigenfunction of the operator S,(1,2) = S;(1) + S,(2) with eigenvalue zero.
Chapter 2 Solutions
Introduction To Quantum Mechanics
Ch. 2.1 - Prob. 2.1PCh. 2.1 - Prob. 2.2PCh. 2.2 - Prob. 2.3PCh. 2.2 - Prob. 2.4PCh. 2.2 - Prob. 2.5PCh. 2.2 - Prob. 2.6PCh. 2.2 - Prob. 2.7PCh. 2.2 - Prob. 2.8PCh. 2.2 - Prob. 2.9PCh. 2.3 - Prob. 2.10P
Ch. 2.3 - Prob. 2.11PCh. 2.3 - Prob. 2.12PCh. 2.3 - Prob. 2.13PCh. 2.3 - Prob. 2.14PCh. 2.3 - Prob. 2.15PCh. 2.3 - Prob. 2.16PCh. 2.4 - Prob. 2.17PCh. 2.4 - Prob. 2.18PCh. 2.4 - Prob. 2.19PCh. 2.4 - Prob. 2.20PCh. 2.4 - Prob. 2.21PCh. 2.5 - Prob. 2.22PCh. 2.5 - Prob. 2.23PCh. 2.5 - Prob. 2.24PCh. 2.5 - Prob. 2.25PCh. 2.5 - Prob. 2.26PCh. 2.5 - Prob. 2.27PCh. 2.5 - Prob. 2.28PCh. 2.6 - Prob. 2.29PCh. 2.6 - Prob. 2.30PCh. 2.6 - Prob. 2.31PCh. 2.6 - Prob. 2.32PCh. 2.6 - Prob. 2.34PCh. 2.6 - Prob. 2.35PCh. 2 - Prob. 2.36PCh. 2 - Prob. 2.37PCh. 2 - Prob. 2.38PCh. 2 - Prob. 2.39PCh. 2 - Prob. 2.40PCh. 2 - Prob. 2.41PCh. 2 - Prob. 2.42PCh. 2 - Prob. 2.44PCh. 2 - Prob. 2.45PCh. 2 - Prob. 2.46PCh. 2 - Prob. 2.47PCh. 2 - Prob. 2.49PCh. 2 - Prob. 2.50PCh. 2 - Prob. 2.51PCh. 2 - Prob. 2.52PCh. 2 - Prob. 2.53PCh. 2 - Prob. 2.54PCh. 2 - Prob. 2.58PCh. 2 - Prob. 2.63PCh. 2 - Prob. 2.64P
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- A particle with mass m is moving along the x-axis in a potential given by the potential energy function U(x) = 0.5mw²x². Compute the product (x, t)*U (x) V (x, t). Express your answer in terms of the time-independent wave function, (x).arrow_forwardConsider the half oscillator" in which a particle of mass m is restricted to the region x > 0 by the potential energy U(x) = 00 for a O where k is the spring constant. What are the energies of the ground state and fırst excited state? Explain your reasoning. Give the energies in terms of the oscillator frequency wo = Vk/m. Formulas.pdf (Click here-->)arrow_forwardThe eigenstates of the particle-in-a-box are written, n = √ sin (™T). If L = 10.0, what is the expectation value for the quantity 2ħ² + p² in the n = 3 eigenstate? Report your answer as a multiple of ħ². (Note: ô = −iħª) d dx'arrow_forward
- Answer the following about an observable that is represented by the operator  = wo (3² + 3²). ħ (4) Is it possible to write a complete set of basis states that are simultaneously eigenstates of the operator Ĵ and Â? If so, explain how you know. If not, write an uncertainty principle for the observables A and J.arrow_forwardConsider the potential barrier illustrated in Figure 1, with V(x) = V₁ in the region 0 L. b) Identify the parts of your solutions that correspond to the incident, reflected and transmitted particles. Explain why the remaining term in the region > L can be set to zero. c) Determine the probability currents associated with the incident, reflected and transmitted particles.arrow_forwardConsider a particle with function : (image) Normalize this function. Qualitatively plot the probability distribution function in terms of x. Where is it most likely to find a particle? Find the expected value of the place and compare it with part C.arrow_forward
- Problem 1.17 A particle is represented (at time=0) by the wave function A(a²-x²). if-a ≤ x ≤+a. 0, otherwise. 4(x, 0) = { (a) Determine the normalization constant A. (b) What is the expectation value of x (at time t = 0)? (c) What is the expectation value of p (at time t = 0)? (Note that you cannot get it from p = md(x)/dt. Why not?) (d) Find the expectation value of x². (e) Find the expectation value of p².arrow_forwardQuestion related to Quantum Mechanics : Problem 1.16arrow_forwardConsider a particle of mass, m, with energy, E, moving to the right from -o. This particle is subject to the potential energy V(x) = }V, for 0 V. x z a Sketch a picture that shows the potential energy. In this picture represent a particle moving to the right when x < 0. Solve the time independent Schrodinger equation to find g (x) on the domain -coarrow_forwardthat de/dx = 0 (x). **Problem 2.25 Check the uncertainty principle for the wave function in Equation 2.129. Hint: Calculating (p2) is tricky, because the derivative of has a step discontinuity at x = 0. Use the result in Problem 2.24(b). Partial answer: (p²) = (ma/h)².arrow_forwardQuestion related to Quantum Mechanics : Problem 3.33arrow_forwardProblem 3.30 Derive the transformation from the position-space wave function to the “energy-space” wave function using the technique of Example 3.9. Assume that the energy spectrum is discrete, and the potential is time-independent.arrow_forwardarrow_back_iosSEE MORE QUESTIONSarrow_forward_ios
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