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 Aug 16 revised Transition integral from 1-D cartesian into 3-D polar coordinate system edited title Aug 16 revised Transition integral from 1-D cartesian into 3-D polar coordinate system added 147 characters in body Aug 16 asked Transition integral from 1-D cartesian into 3-D polar coordinate system Aug 15 comment The probability of finding the electron in the H-atom So this is the full probability... What if i was looking for $P d\theta$? Would i just have to remove the $\int\limits_{0}^{\pi}$? Aug 15 comment The probability of finding the electron in the H-atom I know if i want to get the full probability i need to calculate: $$P=\int\limits_{V}|R(r)|^2|\Phi(\phi)|^2|\Theta(\theta)|^2dV = \int\limits_{V}|R(r)|^2|\Phi(\phi)|^2|\Theta(\theta)|^2\,\,r^2dr\, d\theta \sin\theta d\phi=\\ =\int\limits_{0}^{\infty}r^2|R(r)|^2dr \int\limits_{0}^{\pi}|\Theta(\theta)|^2 \sin\theta d\theta \int\limits_{0}^{2\pi}d\phi$$ I hope i wrote that right and i think that this full integral should equal 1. But somehow it is still not clear to me how to get the $P(r)dr$... How can i interpret the $dr$ after the $P(r)$. What do you think of when you see something like it? Aug 15 comment The probability of finding the electron in the H-atom How do i do this? Aug 15 comment The probability of finding the electron in the H-atom Never mind i think i understand :) Aug 15 comment The probability of finding the electron in the H-atom I have one more question about this. Why did we use the diferential of volume when we are searching for $P(r)dr$ Aug 15 accepted The probability of finding the electron in the H-atom Aug 15 comment The probability of finding the electron in the H-atom Thank you very much. So if we are satisfied with a fraction of a probability there is no need to integrate :) What confused me was that feeling that if we want to integrate the equation we have to do it on both sides and not only one side... It is weird to me that we integrate just part of the equation. Aug 15 asked The probability of finding the electron in the H-atom Aug 8 asked Quantum tunelling problem - got a weird imaginary ratio in the end Aug 7 comment Moving electron - finding the wavefunction Thank you very much for the extended anwser. Now i do understand. Aug 7 accepted Moving electron - finding the wavefunction Aug 7 comment Moving electron - finding the wavefunction Well the Lorentz invariance is a fundamantal equation of relativity and it says that $E=E_0$. If i then use $E=E_k$ to calculate constant $L$ it seems to me that i have violated the special relativity and everything Einstein wrote... Aug 7 comment Moving electron - finding the wavefunction I do not understand... Aug 7 asked Moving electron - finding the wavefunction Aug 7 comment QM - calculating expectation value for velocity of an electron After looking at @Ali's anwser I believe that you meant "momentum operator" instead of the "velocity operator". Thanks for pointing this out as i wasn't sure if i d get $\langle v \rangle^2$ or $\rangle v^2 \langle$ using the kinetic energy method - i guess it is the later huh - can i ask you, how do we know this? Why do we know that by using the kinetic energy method we get $\langle v^2\rangle$ and not $\langle v\rangle^ 2$? For the solution i will take Ali-s anwser. Aug 7 accepted QM - calculating expectation value for velocity of an electron Aug 7 comment QM - calculating expectation value for velocity of an electron Regarding your 1st paragraph. Why did you use the energy $\langle E \rangle$ and an operator $\hat{H}$ instead of $\langle E_k \rangle$ and an operator $\langle \hat{T}\rangle$?