All Questions
31
questions
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Negative Energy [duplicate]
I am uneducated on physics so please excuse my ignorance. I've been looking into negative energy which hasn't made much sense to me thus far. Through what I've read I think negative energy is simply ...
- 21
1
vote
0
answers
77
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Force in the Casimir effect
In the Casimir effect, after performing the regularization, it is found that the zero point energy between two conducting plates in a distance $L$ from eachother is (in the 1D case),
$$E=-\frac{\hbar ...
- 97
0
votes
1
answer
235
views
How to derive bound and unbound states for an absolute value potential?
How do you find for what range of energies the absolute value potential has bound and unbound states?
What I have understood from my previous Intro to Quantum lectures are that in order to derive the ...
- 51
2
votes
2
answers
105
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How does some matter prevent other matter from reaching a lower potential energy state?
Before answering the question, keep in mind that I am a second year Biology student, with no experience in studying Physics and I consider myself 'mathematically illiterate'.
An example of matter ...
- 69
0
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1
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120
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How to prove the bound and scattering states theorem? [duplicate]
In Griffiths it is mentioned that if the energy eigenvalue is less than the value of the potential at + and - infinity, then we have bound states. If however the energy is bigger than the potential at ...
- 369
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1
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39
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How does a potential energy is found given the quantum energy states?
I have thought about it but couldn't figure out how can I find the potential energy given the energy states, I mean for example in Lennard Jones potential there is a finite number of discrete quantum ...
- 51
0
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1
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226
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Understanding the radial equation, why is the left hand side different from the right hand side?
Im studying the hydrogen atom and Ive realized that one side of the radial differential equation isnt equal to the other. What am I getting wrong?
Knowing that the potential for the hydrogen atom is $$...
user348127
0
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2
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810
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Classical analog of the statement "$E$ must exceed the minimum value of $V(x)$
Overall question:
Griffiths problem 2.2 states that $E$ must exceed the minimum value of $V(x)$ for every normalizable solution to the time-independent Schrodinger equation. Then, it asks for a proof ...
- 1,261
6
votes
3
answers
502
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Energy of a photon
I undestand that the energy of a photon is given by $E=h\nu$ where $\nu$ is the frequency of the light. Is this the total energy of the photon? Or its kinetic energy?
1
vote
3
answers
892
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Simple proof that average kinetic equals average potential energy in quantum harmonic oscillator
Is there a simple way to explain why the expectation of the kinetic energy equals the one of the potential energy in the quantum harmonic oscillator? I would like to find a simpler explanation than ...
- 1,100
0
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1
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383
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Reasoning of no negative energy states in the quantum harmonic oscillator [duplicate]
In Griffiths' text on QM, I am trying to understand his logic as to why there can be no states of negative energy. He writes:
What if I apply the lowering operator repeatedly? Eventually I'm going to ...
- 753
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0
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31
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Minimum energy eigenvalue [duplicate]
Why is the energy eigenvalue is always greater than minimum potential for a particle moving in a certain potential?
1
vote
1
answer
156
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Odd function (probability density function) describing the measurable quantity of a quantum particle [closed]
This question is in reference to Quantum Physics of Atoms, Molecue, Solids, Nuclei and particles by Robert Eisberg and Robery Resnick.
The setup for an infinite square quantum well with the potential ...
- 889
0
votes
1
answer
665
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How can Bound state energy be negative if the $V_{min}$ is positive? [duplicate]
We know that Energy must be negative for bound states (as the wavefunction must go to 0 at infinity) but when we are looking at potential wells, we also say that E must be greater than the minimum ...
1
vote
1
answer
1k
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What's the meaning of potential energy in quantum physics?
We know that the definition of potential energy in classic physics. When we start learning about quantum physics and especially the Schrodinger equation we blindly accept the potential energy part. I ...
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