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classes:2009:fall:phys4101.001:q_a_1030 [2009/11/02 14:09] – x500_sohnx020classes:2009:fall:phys4101.001:q_a_1030 [2009/11/30 16:32] (current) – youmans
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 ===Blackbox 2:10 - 11/01/09==== ===Blackbox 2:10 - 11/01/09====
 Yes, it' a kind of Fourier trick. If you look at the equation 2.144, then you would understand how this proof has been made. Yes, it' a kind of Fourier trick. If you look at the equation 2.144, then you would understand how this proof has been made.
 +
 +=== Can 10:48 11/06/09 ===
 +For Chap <f_p'|f_p> = d(p-p'), look at this equation, if p'=p, then d(p'-p)=d(0), and d(p'-p)=0 otherwise. Mathematically, d(0)=1, the physical meaning behind it is the orthonormal of wave function in momentum space.
  
 ====ralph - 11:10AM 10/29/09==== ====ralph - 11:10AM 10/29/09====
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 I think the point Griffiths is trying to make is that the momentum-position uncertainty principle resembles the energy-time uncertainty principle, primarily because the uncertainty for both is <math>\hbar/2</math>.  Although the two uncertainty principles are correlated in special relativity, the quantum mechanics we are dealing with is nonrelativistic, so they are very different.  Specifically, the energy-time uncertainty principle deals with time, which we typically consider to be an independent variable. I think the point Griffiths is trying to make is that the momentum-position uncertainty principle resembles the energy-time uncertainty principle, primarily because the uncertainty for both is <math>\hbar/2</math>.  Although the two uncertainty principles are correlated in special relativity, the quantum mechanics we are dealing with is nonrelativistic, so they are very different.  Specifically, the energy-time uncertainty principle deals with time, which we typically consider to be an independent variable.
  
 +====Dagny====
  
 +What is a good method for finding the determinant of an nxn matrix? Do you think we will need to be able to find such a determinant in this class? Why or why not?
  
 +====Jake22 4:30 11/30/2009==== 
 +Must all non-degenerate energy eigenfunctions be parity eigenfunctions?
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 **Q&A for the next lecture: [[Q_A_1102]]** **Q&A for the next lecture: [[Q_A_1102]]**
classes/2009/fall/phys4101.001/q_a_1030.1257192580.txt.gz · Last modified: 2009/11/02 14:09 by x500_sohnx020

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