美国物理量子力学代考-物理代写-physics代写-电动力学代考

物理量子力学代考，量子力学（Quantum Mechanics），为物理学理论，与电动力学代考，热力学统计物理代写，理论力学代写并称为四大力学金刚，理论物理代写难度比基础物理学高出蛮多，这些科目基本是物理专业的学生才有的课程。量子力学是研究物质世界微观粒子运动规律的物理学分支，主要研究原子、分子、凝聚态物质，以及原子核和基本粒子的结构、性质的基础理论。它与相对论一起构成现代物理学的理论基础。量子力学不仅是现代物理学的基础理论之一，而且在化学代写等学科和许多近代技术中得到广泛应用。

 

物理代写

 

Calculate the product xp of the position and momentum uncertainties for the ground state0 and for the rst excited state 1 of the harmonic oscillator. It may be useful to recall the denitionsof the position and momentum operators in terms of ^a and ^a+:^x =rh2m!(^a + ^a+); ^p = irm!h2(^a ^a+): (1)2 What is Momentum Anyway? Prove thatd hxi

 

dt

 

hpim:Hint: it is helpful to recall the following formulas:ih@@t= h22m@2@x2 + V (x) ; (2)h^ Qi =Z 11(x; t)^Q (x; t)dx; (3)^p = ih@@x: (4)3 Double Delta Potential Consider a particle of mass m in a potential given byV (x) = ; ; a > 0:This system has two bound states for very large a, but only a single bound state for very small a.

 

- (2 pts) The stationary states in this potential may be taken to be either even or odd. Explainwhy in one sentence. (Hint: either look at the form of V (x) or consider the parity operator.)

- (4 pts) Sketch the wave functions of the two bound states for very large a. Be sure to labelwhich of the two is the ground state and which is the excited state. Then sketch the wavefunction of the single bound state for very small a.For

 

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