User 71GA

18

votes

3

answers

3k

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Meaning of inner product $\langle \vec{r} | \psi(t)\rangle $

Jun 16 '13 at 21:11 Community♦ 1

5

8

votes

2

answers

2k

views

Connection between $\Delta x \Delta p \geq \frac{\hbar}{2}$ and $\Delta E \Delta t \geq \frac{\hbar}{2}$

quantum-mechanics quantum-field-theory energy time heisenberg-uncertainty-principle

Jul 27 '13 at 18:05 Community♦ 1

7

votes

5

answers

10k

views

Relativistic momentum

special-relativity mass momentum

Jul 12 '15 at 0:05 Odysseus Ithaca 139

2

6

votes

1

answer

5k

views

Connecting 4-velocity to equation for adding velocities

special-relativity velocity

Sep 16 '17 at 3:51 Muphrid 6,199

6

votes

2

answers

3k

views

Proof for commutator relation $[\hat{H},\hat{a}] = - \hbar \omega \hat{a}$

quantum-mechanics homework-and-exercises operators harmonic-oscillator commutator

May 4 '13 at 11:37 Eugene B 404

2

6

votes

2

answers

2k

views

Amplitude of Probability amplitude. Which one is it?

quantum-mechanics terminology wavefunction probability complex-numbers

Feb 18 '13 at 21:35 JKL 3,356

6

votes

3

answers

984

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Probability and probability amplitude

quantum-mechanics probability

Jan 24 '13 at 21:32 ThomasS 66

3

6

votes

1

answer

4k

views

Minkowski diagram, hyperbola and invariant quantity of relativity

special-relativity minkowski-space

Nov 5 '12 at 21:07 71GA 2,220

4

5

votes

2

answers

12k

views

Deriving group velocity

quantum-mechanics waves superposition phase-velocity

Aug 5 at 8:17 Qmechanic♦ 116k

2

5

votes

2

answers

2k

views

Kinetic energy of a photon and Schwarzschild radius

black-holes photons

Mar 27 '14 at 1:04 Community♦ 1

2

5

votes

3

answers

5k

views

Minkowski diagram and length contraction

special-relativity minkowski-space

Oct 23 '12 at 19:00 71GA 2,220

2

4

votes

3

answers

24k

views

How to get “complex exponential” form of wave equation out of “sinusoidal form”?

homework-and-exercises waves complex-numbers linear-systems

Feb 1 '17 at 9:45 BLAZE 2,203

2

4

votes

2

answers

6k

views

Pair production - mathematically?

kinematics photons momentum conservation-laws pair-production

Nov 1 '15 at 1:02 Qmechanic♦ 116k

1

4

votes

3

answers

7k

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Finite potential well problem - calculating the ground state

quantum-mechanics homework-and-exercises eigenvalue

Jun 12 '14 at 10:07 Gigi Butbaia 1,046

4

votes

2

answers

2k

views

Wavefunction as a combination of two stationary states - how to find those states?

quantum-mechanics homework-and-exercises wavefunction schroedinger-equation potential

Aug 8 '13 at 13:34 Qmechanic♦ 116k

2

4

votes

2

answers

665

views

QM formalism is one big confusion - lack of geometrical explaination with images

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May 1 '13 at 19:06 Community♦ 1

1

4

votes

2

answers

3k

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Plotting $\psi$ for finite square well potential

quantum-mechanics homework-and-exercises schroedinger-equation potential

Apr 6 '13 at 11:00 Qmechanic♦ 116k

1

4

votes

2

answers

1k

views

Heisenberg uncertainty principle derivation - unexplained factor of $4 \sigma_k^2$ in Gaussian

quantum-mechanics heisenberg-uncertainty-principle

Feb 28 '13 at 21:04 Mark Eichenlaub 47.2k

3

votes

1

answer

223

views

Tunneling and transmission

quantum-mechanics homework-and-exercises schroedinger-equation scattering quantum-tunneling

Nov 22 '17 at 15:35 Qmechanic♦ 116k

2

3

votes

2

answers

8k

views

Calculating the expectation value for kinetic energy $\langle E_k \rangle$ for a known wave function

quantum-mechanics homework-and-exercises integration

Aug 2 '13 at 9:14 Community♦ 1

4

3

votes

1

answer

317

views

Observables - what are they?

quantum-mechanics operators observables

May 24 '13 at 16:08 Izzhov 1,090

3

votes

1

answer

4k

views

Schrödinger equation for a harmonic oscillator

quantum-mechanics homework-and-exercises schroedinger-equation harmonic-oscillator

Apr 30 '13 at 10:03 Eugene B 404

1

3

votes

1

answer

2k

views

Finite, square, potential well

quantum-mechanics homework-and-exercises wavefunction schroedinger-equation potential

Apr 6 '13 at 11:36 Qmechanic♦ 116k

2

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0

answers

66

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Quantum harmonic oscillator - book that does it all right [duplicate]

quantum-mechanics resource-recommendations harmonic-oscillator

May 7 at 20:15 Qmechanic♦ 116k

2

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2

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11k

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Energies and numbers of bound states in finite potential well

quantum-mechanics homework-and-exercises schroedinger-equation potential

Apr 12 at 6:17 71GA 2,220

1

2

votes

2

answers

3k

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How do we know that $\psi$ is the eigenfunction of an operator $\hat{H}$ with eigenvalue $W$?

quantum-mechanics operators hamiltonian eigenvalue

Apr 30 '18 at 20:44 NewDogOldTricks 325

1

2

votes

2

answers

280

views

Trying to read phase shift constant from the graphs

waves

Jan 17 '17 at 13:35 Kamil Maciorowski 466

3

2

votes

1

answer

4k

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Gaussian wave packet

quantum-mechanics homework-and-exercises wavefunction heisenberg-uncertainty-principle fourier-transform

Sep 26 '13 at 6:39 Community♦ 1

2

votes

1

answer

288

views

Term symbol - how do we know the number of electrons $e^-$?

angular-momentum quantum-spin atoms notation

Sep 8 '13 at 21:42 71GA 2,220

2

votes

1

answer

1k

views

After normalizing a wavefunction I don't know how to calculate probability on an interval (-0.1 + 0.1)

quantum-mechanics homework-and-exercises

Aug 1 '13 at 15:34 71GA 2,220

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102 Questions

Meaning of inner product $\langle \vec{r} | \psi(t)\rangle $

Connection between $\Delta x \Delta p \geq \frac{\hbar}{2}$ and $\Delta E \Delta t \geq \frac{\hbar}{2}$

Relativistic momentum

Connecting 4-velocity to equation for adding velocities

Proof for commutator relation $[\hat{H},\hat{a}] = - \hbar \omega \hat{a}$

Amplitude of Probability amplitude. Which one is it?

Probability and probability amplitude

Minkowski diagram, hyperbola and invariant quantity of relativity

Deriving group velocity

Kinetic energy of a photon and Schwarzschild radius

Minkowski diagram and length contraction

How to get “complex exponential” form of wave equation out of “sinusoidal form”?

Pair production - mathematically?

Finite potential well problem - calculating the ground state

Wavefunction as a combination of two stationary states - how to find those states?

QM formalism is one big confusion - lack of geometrical explaination with images

Plotting $\psi$ for finite square well potential

Heisenberg uncertainty principle derivation - unexplained factor of $4 \sigma_k^2$ in Gaussian

Tunneling and transmission

Calculating the expectation value for kinetic energy $\langle E_k \rangle$ for a known wave function

Observables - what are they?

Schrödinger equation for a harmonic oscillator

Finite, square, potential well

Quantum harmonic oscillator - book that does it all right [duplicate]

Energies and numbers of bound states in finite potential well

How do we know that $\psi$ is the eigenfunction of an operator $\hat{H}$ with eigenvalue $W$?

Trying to read phase shift constant from the graphs

Gaussian wave packet

Term symbol - how do we know the number of electrons $e^-$?

After normalizing a wavefunction I don't know how to calculate probability on an interval (-0.1 + 0.1)