1. Infinite-Potential Well Revisited V(x) V = 0 V = ∞ V = 0 L x = +5 x = 2 Consider the quantum mechanics of a particle with mass m that is confined in the infin
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(b)
Introduction:
The finite potential well is an extension of the infinite potential well in which a particle is confined to a box, but one which has finite potential walls.
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- 1. By providing step by step computations, show that the effect of the following quantum circuit is to interchange the state of two qubits (a, b). Provide the corresponding 4 x 4 matrix of the circuit.4. Find the points of maximum and minimum probability density for the nth state of a particle in a one- dimensional box. Check your result for the n=2 state.The energy eigenvalues of the 1D quantum harmonic oscillator are I. nondegenerate II. positive III. integral multiples of hw O I. and II. OI. II. and III. O I. and III.
- 3. Particle in a 2D Box. A quantum mechanical particle is confined in side a square 2D box, with side length L. Inside the box V=0 and outside the box V=infinity. Let the wave function to be (x,y). (a) write down the Schrodinger equation of (x,y). (b) Use the separation of variable method solve (x,y) (let the quantum numbers to be nx and ny.) (c) What is the energy for the state (nx, ny)? (d) What is the probability density p(x,y) for the state nx=3 and ny=3? Sketch this p(x,y) in a square.4. Use the variational principle to estimate the ground state energy of a particle in the potential (∞0 x < 0 U(x) = \cx x≥0 Take xe-bx as a trial function.4. Normalize the following wavefunctions 4 55 (a) v(x) = sin (#2); =sin(); for a particle in a 1D box of length L. (b) (2) = xe-z|2 (c) (x) = e(x²/a²)+(ikz) 5. In a region of space, a particle with mass m and with zero energy has a time- independent wave-function (x) = Ae-2/12, where A and L are constants. Use your knowledge of the Schrödinger equation to determine the potential energy V(x) of the particle. Plot the potential function? What is the minimum potential energy for the particle, if it is an electron and L = 1 fm? Is this potential repulsive or attractive?