What is the physical meaning of the "decay rate" in Fermis golden rule?
109545
Interpretation of "transition rate" in Fermi's golden rule
59004
Why does time evolution operator have the form $U(t) = e^{-itH}$?
94637
What does Fermi level in the band gap mean?
54968
Confusion about Length Contraction (ex in Muon decay)
25425
Intuition for the definition of the Gamma function?
35354
What's the difference between Fermi Energy and Fermi Level?
41041
Does a photon instantaneously gain $c$ speed when emitted from an electron?
140005
How will a particle with energy less than $V_{\rm min}$ behave?
33126
Why does the Boltzmann factor $e^{-E/kT}$ seem to imply that lower energies are more likely?
113272
Is the quantum state fidelity defined as $F(\rho, \sigma)=\text{tr}\sqrt{\rho^{1/2}\sigma\rho^{1/2}}$ or its square?
57428
Physical Interpretation of Planck's Constant
141174
What is the half-life threshold for an isotope to be considered stable?
46450
Physical meaning of quantum operators
88637
Why can a particle decay into two photons but not one?
5848
How come neutrons in a nucleus don't decay?
117383
What is the value of $\Gamma(\mathrm{i})$ ?
34004
Why is time evolution unitary?