User 71GA

18 votes

3 answers

3k views

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

asked May 24, 2013 at 19:44

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

asked Jul 27, 2013 at 7:55

7 votes

4 answers

6k views

Minkowski diagram and length contraction

special-relativity metric-tensor coordinate-systems inertial-frames

asked Oct 23, 2012 at 17:03

7 votes

1 answer

5k views

Minkowski diagram, hyperbola and invariant quantity of relativity

special-relativity

asked Nov 4, 2012 at 4:13

7 votes

5 answers

11k views

Relativistic momentum

special-relativity mass momentum

asked Nov 11, 2012 at 20:48

7 votes

2 answers

18k views

Deriving group velocity

quantum-mechanics waves superposition phase-velocity

asked Jan 27, 2013 at 15:51

6 votes

2 answers

2k views

Amplitude of Probability amplitude. Which one is it?

quantum-mechanics terminology wavefunction probability complex-numbers

asked Feb 8, 2013 at 14:29

6 votes

3 answers

1k views

Probability and probability amplitude

quantum-mechanics probability

asked Jan 23, 2013 at 14:48

6 votes

1 answer

7k views

Connecting 4-velocity to equation for adding velocities

special-relativity velocity

asked Dec 10, 2012 at 19:23

6 votes

2 answers

4k views

Plotting $\psi$ for finite square well potential

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

asked Apr 1, 2013 at 20:54

6 votes

2 answers

4k views

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

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

asked May 4, 2013 at 5:41

5 votes

1 answer

477 views

Observables - what are they?

quantum-mechanics operators observables

asked May 24, 2013 at 15:19

5 votes

2 answers

22k views

Energies and numbers of bound states in finite potential well

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

asked Apr 5, 2013 at 11:16

5 votes

2 answers

2k views

Kinetic energy of a photon and Schwarzschild radius

black-holes photons

asked Jan 18, 2013 at 15:15

5 votes

3 answers

27k views

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

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

asked Feb 4, 2013 at 7:24

5 votes

3 answers

9k views

Finite potential well problem - calculating the ground state

quantum-mechanics homework-and-exercises eigenvalue

asked Aug 6, 2013 at 12:37

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

asked Aug 6, 2013 at 22:29

4 votes

2 answers

12k views

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

quantum-mechanics homework-and-exercises integration

asked Aug 1, 2013 at 22:59

4 votes

2 answers

759 views

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

quantum-mechanics hilbert-space

asked May 1, 2013 at 12:23

4 votes

2 answers

1k views

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

quantum-mechanics heisenberg-uncertainty-principle

asked Feb 28, 2013 at 1:54

4 votes

1 answer

2k views

Finite, square, potential well

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

asked Mar 30, 2013 at 15:23

4 votes

2 answers

7k views

Pair production - mathematically?

kinematics photons momentum conservation-laws pair-production

asked Jan 13, 2013 at 11:50

3 votes

1 answer

840 views

Derivation of the Lorentz transformation

special-relativity

asked Sep 7, 2012 at 5:59

3 votes

1 answer

268 views

Tunneling and transmission

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

asked Apr 22, 2013 at 8:50

3 votes

1 answer

6k views

Gaussian wave packet

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

asked Feb 24, 2013 at 11:04

3 votes

1 answer

7k views

Schrödinger equation for a harmonic oscillator

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

asked Apr 29, 2013 at 7:37

2 votes

2 answers

4k views

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

quantum-mechanics operators hamiltonian eigenvalue

asked May 10, 2013 at 12:12

2 votes

1 answer

2k views

Some Dirac notation explanations

quantum-mechanics operators hilbert-space

asked May 12, 2013 at 7:21

2 votes

2 answers

2k views

Vector $\vec{z}$ and its conjugate transpose $\overline{\vec{v}^\top}$ - is it the same as $\left|z\right\rangle$ and $\left\langle z \right|$

quantum-mechanics hilbert-space notation

asked May 18, 2013 at 11:24

2 votes

1 answer

382 views

Compton scatering problem - How to solve this large problem faster using the momentum system?

homework-and-exercises scattering

asked Jul 16, 2013 at 12:30

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98 Questions

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

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

Minkowski diagram and length contraction

Minkowski diagram, hyperbola and invariant quantity of relativity

Relativistic momentum

Deriving group velocity

Amplitude of Probability amplitude. Which one is it?

Probability and probability amplitude

Connecting 4-velocity to equation for adding velocities

Plotting $\psi$ for finite square well potential

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

Observables - what are they?

Energies and numbers of bound states in finite potential well

Kinetic energy of a photon and Schwarzschild radius

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

Finite potential well problem - calculating the ground state

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

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

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

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

Finite, square, potential well

Pair production - mathematically?

Derivation of the Lorentz transformation

Tunneling and transmission

Gaussian wave packet

Schrödinger equation for a harmonic oscillator

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

Some Dirac notation explanations

Vector $\vec{z}$ and its conjugate transpose $\overline{\vec{v}^\top}$ - is it the same as $\left|z\right\rangle$ and $\left\langle z \right|$

Compton scatering problem - How to solve this large problem faster using the momentum system?