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- Question A6 Consider an infinite square well with V = 0 in the interval -L/2 < x < L/2, and V → ∞ everywhere else. A particle of mass m is in the groundstate of this system, and is known to have a wavefunction and energy given by TX √ = COS and E = π²h² 2mL² The system is then perturbed so that its potential takes the constant value Va) Write down the one-dimensional time-dependent Schro ̈dinger equation for a wavefunction Ψ(t, x) in a potential V (x). b) Write down the one-dimensional time-independent Schro ̈dinger equation for a wavefunc- tion ψ(x) in a potential V (x). c) Assuming that Ψ(t,x) corresponds to an energy eigenstate, write down a mathematical expression that relates the solutions of the one-dimensional time-dependent and time- independentSchro ̈dingerequations,Ψ(t,x)andψ(x).A particle has a wave function y(r)= Ne¯u , where N and a are real and positive constants. a) Determine the normalization value N. b) Find the average value of y c) Obtain the dispersion (Ar)? Note, you can use dz =r'(n+1) = n!V (x) = 00, V(x) = 0, x<0,x 2 a 0please answer c) only 2. a) A spinless particle, mass m, is confined to a two-dimensional box of length L. The stationary Schrödinger equation is - +a) v(x, y) = Ev(x, y), for 0 < r, y < L. The bound- ary conditions on ý are that it vanishes at the edges of the box. Verify that solutions are given by 2 v(1, y) sin L where n., ny = 1,2..., and find the corresponding energy. Let L and m be such that h'n?/(2mL²) = 1 eV. How many states of the system have energies between 9 eV and 24 eV? b) We now consider a macroscopic box (L of order cm) so that h'n?/(2mL?) ~ 10-20 eV. If we define the wave vector k as ("", ""), show that the density of states g(k), defined such that the number of states with |k| between k and k +dk is given by g(k)dk, is Ak 9(k) = 27 c) Use the expression for g(k) to show that at room temperature the partition function for the translational energy of a particle in a macroscopic 2-dimensional box is Z1 = Aoq, where 2/3 oq = ng = mk„T/2nh?. Hence show that the average…A neutron of mass m of energy E a,V(x) = Vo ) II. Estimate the kinetic energy of the neutron when they reach region III.A 4.90g Particle confined to a box of length L has a speed of 4.70mm/s a) lalhat is the classical Kinetic energy of Particle? the b) If the energy of the first excited State (n=2) is equal to the Kinetic energy found in part (a), what is the value Note: Answer must be in mi L? of c) Is the result found in part (b) realistic ? Explain.1. (1) Derive one dimensional time-independent Schrödinger equation from the classical wave equation and P=h/h and (2) deduce momentum operator and kinetic energy operator for the wave function y. 2. Calculate the specific density function of a single particle, |v|2, on one-dimensional axis (x-axis) including the boundary condition as below; = 00 at x L 3. If the single particle of problem 2 is electron and the L is 10 Å, what are its momentum and energy of the electron with the quantum number of 2? And if there are 1 mole of electrons with the same environment, describe what is the total energy. (mass of electron =9.1 × 10 31 kg, Planck's constant, h= 6.63 × 10-3ª m² kg / s, and Avogadro's number is 6.02 x 10²*. You can choose any unit to show the answer.) 4. Dervie three dimensional time-independent Schrödinger equation for one-electron based on spherical coordinate from Cartesian coordinate system as below. Hemiltonian operator for one-electron system: -h? ( a2 H = 8n2m ax2 ay2 ™…A particle is described by the wavefunction Ψ(t, x), and the momentum operator is denoted by pˆ. a) Write down an expression for the differential operator pˆ. b) Write down an expression for the expectation value of the momentum, ⟨p⟩. c) Write down an expression for the probability density, ρ. d) Write down an expression for the probability of finding the particle between x = a and x = b.