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4-9. The momentum operator in two dimensions is Using the wave function given in Problem 4–8,...
A free electron is described by the wave function: Using the linear momentum operator, derive an expression for the mo...
A free electron is described by the wave function:
Using the linear momentum operator, derive an expression for
the momentum of the electron. Is your answer consistent with de
Broglie's equation?
Write answers clearly on the sheet. Show all working and underline your final answer 1. A free electron is described by the wave function, *(x) = Ae ** Using the linear momentum operator, P = -ih d/dx, derive an expression for the momentum of the electron. Is your answer...
2. Variational Principle. The energy of a system with wave function ψ is given by where...
2. Variational Principle. The energy of a system with wave function ψ is given by where H is the energy operator. The variational principle is a method by which we guess a trial form for the wave function φ, with adjustable parameters, and minimize the resulting energy with respect to the adjustable parameters. This essentially chooses a "best fit" wave function based on our guess. Since the energy of the system with the correct wave function will always be minimum...
tthe-independent Help: The operator expression dimensions is given by H 2m r ar2 [2] A particle of mass m is in a three-dimensional, spherically symmetric harmonic oscillator potential given by V...
tthe-independent Help: The operator expression dimensions is given by H 2m r ar2 [2] A particle of mass m is in a three-dimensional, spherically symmetric harmonic oscillator potential given by V(r)2r2. The particle is in the I-0 state. Noting that all eigenfunetions must be finite everywhere, find the ground-state radial wave-function R() and the ground-state energy. You do not have to nor oscillator is g (x) = C x exp(-8x2), where C and B are constants) harmonic malize the solution....
3. (18 points) The angular momentum operator in the y direction is given by: ly- while the positi...
3. (18 points) The angular momentum operator in the y direction is given by: ly- while the position operator in the x direction is given by: & x. a. (10 points) Determine the commutator for these operators when applied to the dummy function f(x). b. (8 points) What does the value of the commutator tell us about the relationship between the quantum mechanical observables associated with these two operators? Explain
3. (18 points) The angular momentum operator in the y...
1. Variational method In this problem, you will approximate the ground state wave function of a...
1. Variational method In this problem, you will approximate the ground state wave function of a quantum system using the variational theory. Use the trial wave function below 2 cos/T) , 1x1 trial a/2 to approximate the ground state of a harmonic oscillator given by 2.2 2 using a as an adjustable parameter. (a) Calculate the expectation value for the kinetic energy, (?) trial 4 points (b) Calculate the expectation value for the potential energy, Virial. Sketch ??tria, (V)trial, and...
Problem 4. Imagine you are a biophysical chemist and are interested in electron transport by membrane...
Problem 4. Imagine you are a biophysical chemist and are interested in electron transport by membrane proteins. Let us consider the following wave function: (The above wave function corresponds to a free particle for which the potential energy V= 0) (a) Is the above wave function an eigenfunction of the momentum operator p? (b) Is the above wave function an eigenfunction of the operator for the momentum squared p2 ? (c) If your answer to part (b) is yes, then...
Consider a particle confined to one dimension and positive r with the wave function 0, z<0...
Consider a particle confined to one dimension and positive r with the wave function 0, z<0 where N is a real normalization constant and o is a real positive constant with units of (length)-1. For the following, express your answers in terms of a: a) Calculate the momentum space wave function. b) Verify that the momentum space wave function is normalized such that (2.4) c) Use the momentum space wave function to calculate the expectation value (p) via (2.5)
1. The wave-functions of the states [4) and (0) are given by y(x) and Q(x), respectively....
1. The wave-functions of the states [4) and (0) are given by y(x) and Q(x), respectively. Derive the expression for the inner product (14) in terms of the wave- functions Q(x) and (x). What is the physical meaning of y(x) and (x)/2? 2. Fig. 1 shows a sketch of y(x). Sketch y(x) such that the states (4) and (o) are orthogonal: (014) = 0. (x) M Figure 1 3. Assume a particle has a wave-function y(x) sketched in Fig. 2....
1. The wave-functions of the states [4) and (0) are given by y(x) and Q(x), respectively....
1. The wave-functions of the states [4) and (0) are given by y(x) and Q(x), respectively. Derive the expression for the inner product (14) in terms of the wave- functions Q(x) and (x). What is the physical meaning of y(x) and (x)/2? 2. Fig. 1 shows a sketch of y(x). Sketch y(x) such that the states (4) and (o) are orthogonal: (014) = 0. (x) M Figure 1 3. Assume a particle has a wave-function y(x) sketched in Fig. 2....
Consider a particle confined to one dimension and positive z with the wave function 0 where...
Consider a particle confined to one dimension and positive z with the wave function 0 where N is a real normalization constant and α is a real positive constant with units of (length)-1. For the following, express your answers in terms of α: f) Calculate the expectation value of the momentum, (p) via the canonical expression -0o g) Calculate the expectation value of (p) via the canonical expression h) Use your results for(i) and (pay to calculate the variance in...
A free electron is described by the wave function:
Using the linear momentum operator, derive an expression for
the momentum of the electron. Is your answer consistent with de
Broglie's equation?
Write answers clearly on the sheet. Show all working and underline your final answer 1. A free electron is described by the wave function, *(x) = Ae ** Using the linear momentum operator, P = -ih d/dx, derive an expression for the momentum of the electron. Is your answer...
2. Variational Principle. The energy of a system with wave function ψ is given by where H is the energy operator. The variational principle is a method by which we guess a trial form for the wave function φ, with adjustable parameters, and minimize the resulting energy with respect to the adjustable parameters. This essentially chooses a "best fit" wave function based on our guess. Since the energy of the system with the correct wave function will always be minimum...
tthe-independent Help: The operator expression dimensions is given by H 2m r ar2 [2] A particle of mass m is in a three-dimensional, spherically symmetric harmonic oscillator potential given by V(r)2r2. The particle is in the I-0 state. Noting that all eigenfunetions must be finite everywhere, find the ground-state radial wave-function R() and the ground-state energy. You do not have to nor oscillator is g (x) = C x exp(-8x2), where C and B are constants) harmonic malize the solution....
3. (18 points) The angular momentum operator in the y direction is given by: ly- while the position operator in the x direction is given by: & x. a. (10 points) Determine the commutator for these operators when applied to the dummy function f(x). b. (8 points) What does the value of the commutator tell us about the relationship between the quantum mechanical observables associated with these two operators? Explain
3. (18 points) The angular momentum operator in the y...
1. Variational method In this problem, you will approximate the ground state wave function of a quantum system using the variational theory. Use the trial wave function below 2 cos/T) , 1x1 trial a/2 to approximate the ground state of a harmonic oscillator given by 2.2 2 using a as an adjustable parameter. (a) Calculate the expectation value for the kinetic energy, (?) trial 4 points (b) Calculate the expectation value for the potential energy, Virial. Sketch ??tria, (V)trial, and...
Problem 4. Imagine you are a biophysical chemist and are interested in electron transport by membrane proteins. Let us consider the following wave function: (The above wave function corresponds to a free particle for which the potential energy V= 0) (a) Is the above wave function an eigenfunction of the momentum operator p? (b) Is the above wave function an eigenfunction of the operator for the momentum squared p2 ? (c) If your answer to part (b) is yes, then...
Consider a particle confined to one dimension and positive r with the wave function 0, z<0 where N is a real normalization constant and o is a real positive constant with units of (length)-1. For the following, express your answers in terms of a: a) Calculate the momentum space wave function. b) Verify that the momentum space wave function is normalized such that (2.4) c) Use the momentum space wave function to calculate the expectation value (p) via (2.5)
1. The wave-functions of the states [4) and (0) are given by y(x) and Q(x), respectively. Derive the expression for the inner product (14) in terms of the wave- functions Q(x) and (x). What is the physical meaning of y(x) and (x)/2? 2. Fig. 1 shows a sketch of y(x). Sketch y(x) such that the states (4) and (o) are orthogonal: (014) = 0. (x) M Figure 1 3. Assume a particle has a wave-function y(x) sketched in Fig. 2....
1. The wave-functions of the states [4) and (0) are given by y(x) and Q(x), respectively. Derive the expression for the inner product (14) in terms of the wave- functions Q(x) and (x). What is the physical meaning of y(x) and (x)/2? 2. Fig. 1 shows a sketch of y(x). Sketch y(x) such that the states (4) and (o) are orthogonal: (014) = 0. (x) M Figure 1 3. Assume a particle has a wave-function y(x) sketched in Fig. 2....
Consider a particle confined to one dimension and positive z with the wave function 0 where N is a real normalization constant and α is a real positive constant with units of (length)-1. For the following, express your answers in terms of α: f) Calculate the expectation value of the momentum, (p) via the canonical expression -0o g) Calculate the expectation value of (p) via the canonical expression h) Use your results for(i) and (pay to calculate the variance in...
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