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Results tagged with homework-and-exercises
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user 38737
Applies to questions of primarily educational value - not only questions that arise from actual homework assignments, but any question where it is preferable to guide the asker to the answer rather than giving it away outright. Please READ THE GUIDANCE IN META before asking homework-like questions.
0
votes
1
answer
493
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One problem on Classical Mechanics [closed]
I'm wondering why in this problem I can't apply newton second law? The mass $m$ of the moving part will be the mass solved in the problem.
- 269
0
votes
1
answer
1k
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Chemical potential in terms of temperature and pressure
For part (a), I know how to take the partial derivatives of S to get chemical potential, pressure. But there seems that I still need one equation to correctly express chemical potential in terms of T …
- 269
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votes
1
answer
155
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Adiabatic Relation in Plasma Invariant and Thermodynamics
In the problem above, I know how to do the 1D part. Basically, you just plug $V_{\parallel} =
\frac{J}{L}$ into $\langle \frac{1}{2} m v^2\rangle = \frac{1}{2} k T$. After you get $T$ in terms of $ …
- 269
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votes
2
answers
1k
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Two-state Hamiltonian matrix in basis
I have a homework problem as following:
Write the two-state Hamiltonian matrix in a certain basis |1>, |2> in a general form as
\begin{array}{ccc}
H_{11} & H_{12} \\
H_{21} & H_{22} \end{array}
…
- 269
1
vote
1
answer
621
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Derivation of $a_{j}$ coefficients in the quantum harmonic oscillator
In Griffiths' book page 53, when we derive the solution of the quantum harmonic oscillator by using the power series way, we have: $$a_{j+2} = \frac{2j+1-K}{(j+1)(j+2)}\, a_{j} .$$ And for large $j$, …
- 269
1
vote
1
answer
830
views
Complex Conjugate of Wave Function's Derivative [closed]
I am reading Griffiths QM textbook and I got confused by the following identity:
How to prove from $$\frac{\partial \Psi}{\partial t} = \frac{i\hbar}{2m} \frac{\partial^2 \Psi}{\partial x^2} - \frac …
- 269
1
vote
1
answer
2k
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Electric field generated by a point charge moving at the speed of light
As you see, this is the electric field generated by a point charge moving at constant speed v. I know that when $v$ -> 0, $E$ is just the Coloumb Law. But how do you interpret $E$ when $v$ -> $c$ ? …
- 269