User agaminon - Physics Stack Exchange

11 votes

4 answers

3k views

Are there any nonlinear Schrödinger equations?

asked Jul 12, 2022 at 20:16

10 votes

5 answers

4k views

Is there a "fundamental problem of thermodynamics"?

asked Dec 5, 2022 at 14:40

6 votes

1 answer

106 views

Why is the neutron cross section of hydrogen larger than that of deuterium?

asked Jul 14 at 12:08

6 votes

2 answers

245 views

Were there any explanations as for the stability of matter before the advent of quantum mechanics?

asked Nov 2, 2022 at 15:59

6 votes

5 answers

1k views

Why isn't the free expansion of a gas in an adiabatic container isentropic?

asked Oct 2, 2022 at 14:17

4 votes

3 answers

1k views

Is David Tong incorrect in this remark about classical mechanics in his QM lectures?

asked Jul 15, 2022 at 21:39

4 votes

2 answers

507 views

Is this a correct way of understanding the third law of thermodynamics?

asked Jan 14, 2023 at 20:38

3 votes

2 answers

665 views

How can both of these equations for pressure be correct?

asked Nov 22, 2022 at 2:12

3 votes

1 answer

223 views

How did Einstein develop his harmonic oscillator model for solids if there was no solution for the quantum harmonic oscillator yet?

asked Jul 22, 2023 at 20:00

3 votes

4 answers

177 views

Are the postulates of QM independent of interpretation, or based on Copenhagen?

asked Apr 19 at 15:21

2 votes

1 answer

100 views

What do you think about this particularization of the Euler-Lagrange equation that resembles Newton's 2nd Law?

asked Jun 19, 2022 at 23:23

2 votes

2 answers

136 views

Why isn't there a discontinuity in the derivative of the wavefunction with a finite square well?

asked May 26, 2023 at 17:08

2 votes

2 answers

76 views

What do these negative mass values obtained from the Lane-Emdem equation entail?

asked Dec 11, 2022 at 13:13

2 votes

1 answer

101 views

Clearing up concepts regarding quasi-static processes

asked May 17, 2022 at 23:28

1 vote

1 answer

54 views

How do I find the form of a wave equation given initial conditions?

asked May 10, 2022 at 0:07

1 vote

0 answers

46 views

Does the continuity equation for fluids simply state that the material derivative of density is 0?

asked May 10, 2022 at 19:56

1 vote

1 answer

98 views

Why is this the requirement for invertibility within the context of canonical transformations in mechanics?

asked Apr 5, 2022 at 0:00

1 vote

1 answer

73 views

Are there non time-symmetric systems that increase total energy over time?

asked Apr 27, 2022 at 14:37

1 vote

2 answers

732 views

Why is this term 0 in the derivation of the parallel axis theorem?

asked Apr 2, 2021 at 16:28

1 vote

1 answer

1k views

Why is a photon's energy directly proportional to its frequency?

asked Jan 11, 2022 at 22:56

1 vote

2 answers

202 views

Is the Heisenberg uncertainty principle limited to measurements in the same direction?

asked Jul 22, 2022 at 16:44

1 vote

2 answers

228 views

Is vapor pressure conserved during an adiabatic ascent of an air parcel?

asked May 22, 2022 at 0:14

1 vote

1 answer

583 views

Which of these is the beta factor in special relativity? [closed]

asked May 29, 2022 at 22:29

1 vote

0 answers

260 views

Is the Schrödinger equation the heat equation with imaginary constants?

asked Jul 13, 2022 at 1:12

1 vote

1 answer

25 views

How do you apply the first uniqueness theorem for Laplace's equation if your volume has two surfaces?

asked Jan 18, 2023 at 4:31

1 vote

1 answer

139 views

What happens to the normalization condition if the wave function is non stationary?

asked Jan 30, 2023 at 19:45

1 vote

1 answer

87 views

In a scalar QFT, how are Feynman diagrams drawn if the interaction Lagrangian has multiple terms?

asked Apr 30 at 23:51

1 vote

3 answers

290 views

What theorem is behind writing an operator in matrix form as outer products?

asked Jun 10, 2023 at 18:02

1 vote

1 answer

52 views

What form would a "real solution" for the Schrödinger equation of a free particle take?

asked Jun 30, 2023 at 15:35

1 vote

1 answer

27 views

Is magnetostatics a more idealized regime than electrostatics?

asked Nov 22, 2023 at 9:31

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72 Questions

Are there any nonlinear Schrödinger equations?

Is there a "fundamental problem of thermodynamics"?

Why is the neutron cross section of hydrogen larger than that of deuterium?

Were there any explanations as for the stability of matter before the advent of quantum mechanics?

Why isn't the free expansion of a gas in an adiabatic container isentropic?

Is David Tong incorrect in this remark about classical mechanics in his QM lectures?

Is this a correct way of understanding the third law of thermodynamics?

How can both of these equations for pressure be correct?

How did Einstein develop his harmonic oscillator model for solids if there was no solution for the quantum harmonic oscillator yet?

Are the postulates of QM independent of interpretation, or based on Copenhagen?

What do you think about this particularization of the Euler-Lagrange equation that resembles Newton's 2nd Law?

Why isn't there a discontinuity in the derivative of the wavefunction with a finite square well?

What do these negative mass values obtained from the Lane-Emdem equation entail?

Clearing up concepts regarding quasi-static processes

How do I find the form of a wave equation given initial conditions?

Does the continuity equation for fluids simply state that the material derivative of density is 0?

Why is this the requirement for invertibility within the context of canonical transformations in mechanics?

Are there non time-symmetric systems that increase total energy over time?

Why is this term 0 in the derivation of the parallel axis theorem?

Why is a photon's energy directly proportional to its frequency?

Is the Heisenberg uncertainty principle limited to measurements in the same direction?

Is vapor pressure conserved during an adiabatic ascent of an air parcel?

Which of these is the beta factor in special relativity? [closed]

Is the Schrödinger equation the heat equation with imaginary constants?

How do you apply the first uniqueness theorem for Laplace's equation if your volume has two surfaces?

What happens to the normalization condition if the wave function is non stationary?

In a scalar QFT, how are Feynman diagrams drawn if the interaction Lagrangian has multiple terms?

What theorem is behind writing an operator in matrix form as outer products?

What form would a "real solution" for the Schrödinger equation of a free particle take?

Is magnetostatics a more idealized regime than electrostatics?