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Exercise 17.3.4.* We discuss here some tricks for evaluating the expectation values of certain operators in the...
Part 3: Perturbation: We want to get the perturbation Hamiltonian H1which includes the first correction to...
Part 3: Perturbation: We want to get the perturbation Hamiltonian H1which includes the first correction to KE Hamiltonian Ho that, we expand (wrt small P) the relativistic KE (in terms of momentum operators), from special relativity. To do P2 C2+m2c4 - mc T E-mc2 = +.. Но The first term inside the dots . .- is Hwhich is A. рз НH 2m В. рз Нi 4m2c С. ра Н 2m D. pа 8m32 Н
4. Let us revisit the shifted harmonic oscillator from problem set 5, but this time through...
4. Let us revisit the shifted harmonic oscillator from problem set 5, but this time through the lens of perturbation theory. The Hamiltonian of the oscillator is given by * 2m + mw?f? + cî, and, as solved for previously, it has eigenenergies of En = hwan + mwra and eigenstates of (0) = N,,,a1 + role of (rc)*/2, where Do = 42 and a=(mw/h) (a) By treating the term cî as a perturbation, show that the first-order correction to...
1. Consider a charged particle bound in the harmonic oscillator potential V(x) = mw x2. A...
1. Consider a charged particle bound in the harmonic oscillator potential V(x) = mw x2. A weak electric field is applied to the system such that the potential energy, U(X), now has an extra term: V(x) = -qEx. We write the full Hamiltonian as H = Ho +V(x) where Ho = Px +mw x2 V(x) = –qEx. (a) Write down the unperturbed energies, EO. (b) Find the first-order correction to E . (c) Calculate the second-order correction to E ....
In this optional assignment you will find the eigenfunctions and eigenenergies of the hydrogen atom using an operator method which involves using Supersymmetric Quantum Mechanics (SUSY QM). In t...
In this optional assignment you will find the eigenfunctions and eigenenergies of the hydrogen atom using an operator method which involves using Supersymmetric Quantum Mechanics (SUSY QM). In the SUSY QM formalism, any smooth potential Vx) (or equivalently Vr)) can be rewritten in terms of a superpotential Wix)l (Based upon lecture notes for 8.05 Quantum Krishna Rajagopal at MIT Physics II as taught by Prof Recall that the Schroedinger radial equation for the radial wavefunction u(r)-r Rfr) can be rewritten...
3 Problem Three [10 points] (The Quantum Oscillator) We have seen in class that the Hamiltonian...
3 Problem Three [10 points] (The Quantum Oscillator) We have seen in class that the Hamiltonian of a particle of a simple Harmonic oscillator potential in one dimension can be expressed in term of the creation and annihilation operators àt and à, respectively, as: or with In >, n = 0,1,..) are the nth eigenstates of the above Hamiltonian. Part A A.1. Show that the energy levels of a simple harmonic oscillator are E,' Aw (nti), n=0, 12, A.2. Calculate...
particle in a cylindrically symmetric potential: do only C please 3. Particle in a cylindrically symmetrical...
particle in a cylindrically symmetric potential:
do only C
please
3. Particle in a cylindrically symmetrical potential: Let pw. be the cylindrical coordinates of a spinless particle (z = pcos y, y psiny: P 20, OS <2m). Assume that the potential energy of this particle depends only one, and not on yor: Vin-V ). Recall that & P R 1 18 dr2 + dy? - apa pap + 2 day? (a) Write, in cylindrical coordinates, the differential operator associated with...
Recall that an energy eigenfunction of any central potential V (r) may be writtren as ψn`m(r,...
Recall that an energy eigenfunction of any central potential V
(r) may be writtren as ψn`m(r, θ, φ) = Rn`(r)Y`m(θ, φ). This
problem explores the behavior of ψ in the vicinity of the origin r
= 0. Recall that the function u(r) = rRn`(r) satisfies the
equation
− ~ 2 2m d 2u dr2 + ~ 2 `(` + 1) 2mr2 + V (r) u = Eu, (1)
where E is the energy eigenvalue. Note that Eq. (1) has the...
1. Explain the variational principle and illustrate it with some example (different from the one in...
1. Explain the variational principle and illustrate it with some example (different from the one in the following point) 2. A trial function for ls electron in hydrogen atom has a form of (r) = e-ara. Derive the nor- malization constant. Explain the difference between this trial function and the true l-electron hydrogen-like orbital. 3. The expression for energy as a function of a for the H-atom using above trial function is given by: E(a) = 3h2a 2me e2a1/2 21/26073/2...
Question 8 please 5. We start with Schrodinger's Equation in 2(x,t) = H¥(x,t). We can write...
Question 8 please
5. We start with Schrodinger's Equation in 2(x,t) = H¥(x,t). We can write the time derivative as 2.4(x, t) = V(x,+) - (xt), where At is a sufficiently small increment of time. Plug the algebraic form of the derivative into Schrodinger's Eq. and solve for '(x,t+At). b. Put your answer in the form (x,t+At) = T '(x,t). c. What physically does the operator T do to the function '(x,t)? d. Deduce an expression for '(x,t+24t), in terms...
SMA #8: Bohr and Schrödinger Models of Hydrogen Here we investigate the relationship between the Schrödinger...
SMA #8: Bohr and Schrödinger Models of Hydrogen Here we investigate the relationship between the Schrödinger and Bohr models of hydrogen-like atoms, following our work in class on both 9 1. Using the appropriate Schrödinger wavefunctions, compute the most probable electron-proton radii (i.e., distances) for 1s, 2p, and 3d states. Do these agree with the corresponding Bohr radii? Hint #1: Remember to maximize the "radial distribution function" P(r) = [rR(r)], i.e., to include the radial Jacobian factor (r2) in your...
Part 3: Perturbation: We want to get the perturbation Hamiltonian H1which includes the first correction to KE Hamiltonian Ho that, we expand (wrt small P) the relativistic KE (in terms of momentum operators), from special relativity. To do P2 C2+m2c4 - mc T E-mc2 = +.. Но The first term inside the dots . .- is Hwhich is A. рз НH 2m В. рз Нi 4m2c С. ра Н 2m D. pа 8m32 Н
4. Let us revisit the shifted harmonic oscillator from problem set 5, but this time through the lens of perturbation theory. The Hamiltonian of the oscillator is given by * 2m + mw?f? + cî, and, as solved for previously, it has eigenenergies of En = hwan + mwra and eigenstates of (0) = N,,,a1 + role of (rc)*/2, where Do = 42 and a=(mw/h) (a) By treating the term cî as a perturbation, show that the first-order correction to...
1. Consider a charged particle bound in the harmonic oscillator potential V(x) = mw x2. A weak electric field is applied to the system such that the potential energy, U(X), now has an extra term: V(x) = -qEx. We write the full Hamiltonian as H = Ho +V(x) where Ho = Px +mw x2 V(x) = –qEx. (a) Write down the unperturbed energies, EO. (b) Find the first-order correction to E . (c) Calculate the second-order correction to E ....
In this optional assignment you will find the eigenfunctions and eigenenergies of the hydrogen atom using an operator method which involves using Supersymmetric Quantum Mechanics (SUSY QM). In the SUSY QM formalism, any smooth potential Vx) (or equivalently Vr)) can be rewritten in terms of a superpotential Wix)l (Based upon lecture notes for 8.05 Quantum Krishna Rajagopal at MIT Physics II as taught by Prof Recall that the Schroedinger radial equation for the radial wavefunction u(r)-r Rfr) can be rewritten...
3 Problem Three [10 points] (The Quantum Oscillator) We have seen in class that the Hamiltonian of a particle of a simple Harmonic oscillator potential in one dimension can be expressed in term of the creation and annihilation operators àt and à, respectively, as: or with In >, n = 0,1,..) are the nth eigenstates of the above Hamiltonian. Part A A.1. Show that the energy levels of a simple harmonic oscillator are E,' Aw (nti), n=0, 12, A.2. Calculate...
particle in a cylindrically symmetric potential:
do only C
please
3. Particle in a cylindrically symmetrical potential: Let pw. be the cylindrical coordinates of a spinless particle (z = pcos y, y psiny: P 20, OS <2m). Assume that the potential energy of this particle depends only one, and not on yor: Vin-V ). Recall that & P R 1 18 dr2 + dy? - apa pap + 2 day? (a) Write, in cylindrical coordinates, the differential operator associated with...
Recall that an energy eigenfunction of any central potential V
(r) may be writtren as ψn`m(r, θ, φ) = Rn`(r)Y`m(θ, φ). This
problem explores the behavior of ψ in the vicinity of the origin r
= 0. Recall that the function u(r) = rRn`(r) satisfies the
equation
− ~ 2 2m d 2u dr2 + ~ 2 `(` + 1) 2mr2 + V (r) u = Eu, (1)
where E is the energy eigenvalue. Note that Eq. (1) has the...
1. Explain the variational principle and illustrate it with some example (different from the one in the following point) 2. A trial function for ls electron in hydrogen atom has a form of (r) = e-ara. Derive the nor- malization constant. Explain the difference between this trial function and the true l-electron hydrogen-like orbital. 3. The expression for energy as a function of a for the H-atom using above trial function is given by: E(a) = 3h2a 2me e2a1/2 21/26073/2...
Question 8 please
5. We start with Schrodinger's Equation in 2(x,t) = H¥(x,t). We can write the time derivative as 2.4(x, t) = V(x,+) - (xt), where At is a sufficiently small increment of time. Plug the algebraic form of the derivative into Schrodinger's Eq. and solve for '(x,t+At). b. Put your answer in the form (x,t+At) = T '(x,t). c. What physically does the operator T do to the function '(x,t)? d. Deduce an expression for '(x,t+24t), in terms...
SMA #8: Bohr and Schrödinger Models of Hydrogen Here we investigate the relationship between the Schrödinger and Bohr models of hydrogen-like atoms, following our work in class on both 9 1. Using the appropriate Schrödinger wavefunctions, compute the most probable electron-proton radii (i.e., distances) for 1s, 2p, and 3d states. Do these agree with the corresponding Bohr radii? Hint #1: Remember to maximize the "radial distribution function" P(r) = [rR(r)], i.e., to include the radial Jacobian factor (r2) in your...
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