71GA

### Questions (102)

 18 Meaning of inner product $\langle \vec{r} | \psi(t)\rangle$ 8 Connection between $\Delta x \Delta p \geq \frac{\hbar}{2}$ and $\Delta E \Delta t \geq \frac{\hbar}{2}$ 7 Relativistic momentum 6 Connecting 4-velocity to equation for adding velocities 6 Proof for commutator relation $[\hat{H},\hat{a}] = - \hbar \omega \hat{a}$

### Reputation (2,230)

 +10 Observables - what are they? +20 Minkowski diagram and length contraction +10 Photons in a gravitational field -2 QM - calculating expectation value for velocity of an electron

 5 Proof for $p=\gamma_Pmu$ 1 What would a person *unmoving* look like on a Minkowski diagram? 1 Bra–ket notation & Schrödinger's cat intepretation 1 Plotting $\psi$ for finite square well potential 1 4-momentum and an $y$ component of momentum

### Tags (78)

 6 momentum × 6 1 potential × 7 4 special-relativity × 29 1 minkowski-space × 4 2 quantum-mechanics × 55 1 relativity × 3 1 homework-and-exercises × 44 1 black-holes × 2 1 schroedinger-equation × 11 1 reference-frames × 2