How should get the expectation value of $1/r$ in the hydrogen atom?
54548
Expectation value for $\frac{1}{r}$ in the $|nlm\rangle$ state of hydrogen
77758
Calculate the uncertainty in velocity of electron
19471
Expectation of an absolute value of a normal random variate
118253
Conditional expectation of $X$ given $\sin(X)$
153422
How to find the corrsponding expression after working with natural units $\hbar=c=1$?
76245
How can I get $(r^{1/x})^x$ to simplify to $r$?
132920
Help with proof that the expected value of $x_i$ is $\bar{X}$
12645
The position of center of mass of electron cloud in an atom
128875
Expectation values of the position operator is equal to zero in case of even potentials?
75902
Expectation of $\frac{1}{x+1}$ of Poisson distribution
8048
How does one account for the momentum of an absorbed photon?
156863
Uncertainty Principle for a Totally Localized Particle
120857
Interpreting the Cross Section Ratio $R$
18732
How do I evaluate $\int \frac{\mathrm{d}x}{e^x + 1} $?
37441
How to calculate the expected value of a standard normal distribution?
130379
How to calculate $(G/H)/(K/H)$?
34815
How to read “E = (mc)²” so as not to mistake for “E = mc²”