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BLAZE
  • Member for 7 years, 10 months
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18 votes
4 answers
4k views

Maxwell's Demon: Why does the entropy of the overall system decrease?

15 votes
4 answers
5k views

Why does the expectation value of an operator $A$ take the form $\langle A\,\rangle=\int{\psi^* (x) A(x) \psi (x) dx}$ in QM?

7 votes
3 answers
5k views

What is the direction of propagating waves of the form $e^{ikx}$?

6 votes
2 answers
2k views

Something special about energy eigenstates when it comes to time evolution?

6 votes
1 answer
171 views

What do these energy level diagrams and notation mean in this Buckminsterfullerene dipole transitions question?

5 votes
4 answers
1k views

Inconsistency between two formulas for Gravitational Potential Energy that don't yield the same result

5 votes
3 answers
1k views

Why is the Rydberg formula giving me incorrect wavelengths?

5 votes
1 answer
1k views

Will heat flow by conduction oscillate until thermodynamic equilibrium is reached in a solid object?

5 votes
2 answers
2k views

Why must $\left(\frac{\partial U}{\partial V}\right)_{T}=0$ for an Ideal Gas?

4 votes
1 answer
214 views

Show that $\mathrm{d}S=\frac{1}{T}\,\mathrm{d}U+\frac{1}{T}\,P\,\mathrm{d}V-\frac{1}{T}\,\mu\,\mathrm{d}N$ [closed]

4 votes
6 answers
3k views

Why is $v=\sqrt{\frac{GM}{r}}$ not a valid equation for escape velocity?

4 votes
2 answers
8k views

Why does a negative reflection coefficient correspond to a phase difference of $\pi$?

3 votes
3 answers
475 views

Tricky question involving finding the magnetic field given the wave equation for the electric field and it's solution

3 votes
4 answers
1k views

If we know the units of a quantity is it valid to write a formula just so that the units are dimensionally correct?

3 votes
1 answer
267 views

Interpretation of the Dirac-measure property

3 votes
2 answers
153 views

What is the origin of this formula $\vec B = -\frac{1}{c^2}\vec v \times \vec E=-\frac{1}{ec^2}\vec v \times \nabla V(r)$?

3 votes
2 answers
2k views

Why does the expectation value of a QM operator squared $\hat{Q}^2$ take the form $\big\langle \hat{Q}^2\big\rangle=\sum\limits_n |a_n|^2{q_n}^2$?

2 votes
3 answers
672 views

How to find transverse component of star's velocity given its proper motion and distance from observation point?

2 votes
1 answer
37 views

Why is there an upper mass limit of $300$ GeV of the Higgs boson for $W/Z$ associated production and t$\bar{\mathrm{t}}$H associated production modes?

2 votes
2 answers
218 views

Where does the factor of $x$ come from in this formula for expectation value?

2 votes
1 answer
354 views

If the Big Bang started in a state of low entropy then shouldn't the Big Crunch be in a state of low entropy also?

2 votes
2 answers
2k views

Confusion regarding the finite square well for a negative potential

2 votes
3 answers
269 views

For a centre-of-mass energy of $3\,\mathrm{GeV}$ is it possible to make a charm quark?

2 votes
1 answer
167 views

Confusion over the standard units used in special relativity and particle physics? [duplicate]

1 vote
1 answer
2k views

If the bound states to the infinite square well are stationary waves, why does the ground state consist of half a wavelength?

1 vote
1 answer
4k views

Degeneracy of states when Spin-Orbit coupling is taken into account

1 vote
2 answers
88 views

Can radiation from nuclear decay be considered a gas?

1 vote
3 answers
233 views

Why is $\frac{d^2}{dx^2}=\left(\frac{d}{dx}\right)^2$ justified in the equation for the square of the momentum operator?

1 vote
2 answers
2k views

Why is the Specific Gibbs function constant during a phase change?

1 vote
2 answers
1k views

Need help understanding why isobaric heat capacity: $\left(\frac{\partial H}{\partial T}\right)_P=\,{T\left(\frac{\partial S}{\partial T}\right)_P}$