hmparticle9's latest activity
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Hhmparticle9 replied to the thread Quantum mechanics book recommendations.I am not struggling with the maths. I am okay with the physics. I just wanted an easy access collection of QM results to refer to. tbh I...
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Hhmparticle9 reacted to MidgetDwarf's post in the thread Quantum mechanics book recommendations with
Like.
If you are struggling with the mathematics of Griffiths, then you do not meet the math prerequisites. It is probably the most math hand... -
Hhmparticle9 posted the thread Calculating ##\langle zHz \rangle## in different ways in Advanced Physics Homework Help.We can calculate ##\langle zHz \rangle## by noting that ##[z,[H,z]] = 2zHz - z^2H - Hz^2##. The author says this is the quick way: it...
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Hhmparticle9 reacted to JimWhoKnew's post in the thread Calculating <r> from <x> with no further calculation with Like.
@PeroK's message in #17 worth repetition: The HA Hamiltonian and the ground state are spherically symmetric, which means they are...
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Hhmparticle9 replied to the thread Calculating <r> from <x> with no further calculation.I am going to come back to this a few times today to make sure I fully understand everything.
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Hhmparticle9 reacted to PeroK's post in the thread Calculating <r> from <x> with no further calculation with Like.
You've probably struggled with this long enough. Let's assume that ##\langle x \rangle## is +ve; i.e., the expected value of ##x## is...
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Hhmparticle9 replied to the thread Calculating <r> from <x> with no further calculation.Yes I am a little embarrassed because I think it is neither. The electron moves around the nucleus if you were to project its location...
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Hhmparticle9 replied to the thread Calculating <r> from <x> with no further calculation.The electron travels around the nucleus. I think the whole thing behind quantum mechanics is that we don't know exactly where the...
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Hhmparticle9 replied to the thread Calculating <r> from <x> with no further calculation.The identity matrix?
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Hhmparticle9 replied to the thread Calculating <r> from <x> with no further calculation.I am not sure. The Hamiltonian is an operator and the ground state of the Hydrogen atom is a function. They are both symmetric in the...
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Hhmparticle9 replied to the thread Calculating <r> from <x> with no further calculation.No worries, I am glad to have the help available. I can't. I know that the ground state ##\psi_{100} = \frac{1}{\sqrt{\pi a^3}}...
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Hhmparticle9 replied to the thread Calculating <r> from <x> with no further calculation.##\langle x \rangle## and ##\langle r \rangle## are scalars. but ## \langle \mathbf{r} \rangle = \langle (x,y,z) \rangle## is a vector...
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Hhmparticle9 replied to the thread Quantum mechanics book recommendations.I will stuck to Griffiths.
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Hhmparticle9 reacted to Meir Achuz's post in the thread Quantum mechanics book recommendations with Like.
Anything below Griffiths would be about QM, but not QM. That's why they are easier.
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Hhmparticle9 replied to the thread Calculating <r> from <x> with no further calculation.I am none the wiser. Without giving it away could you provide me with another nudge? I am trying to approach it by saying "suppose that...