Topics In Quantum Mechanics Video #18: Momentum And Position Commutator

10 Responses

1. 

   Tang Yong Zhong2 June, 2014 at 3:26 pmLog in to Reply

   THIS IS SO MUCH USEFUL !!!!! IT MAY HAVE SAVE MY FINAL TOMORROW !!! I was
   doing hamiltonian with momentum but i don’t understand at all the process
   why until i discover this video. Oh my !! you saved my day !!!
   *sorry for the caps* hahaha XD

2. 

   intergalactic trashcompactor2 May, 2014 at 10:49 pmLog in to Reply

   Wow. A lot of thinks just made sense. The potential function ‘primer’ at
   the end was nice

3. 

   yashley digumber27 March, 2014 at 4:55 pmLog in to Reply

   awesome 🙂 thanks

4. 

   Doreen Stanley8 March, 2014 at 7:01 amLog in to Reply

   You saved me!!!! Thanks a million!!!!

5. 

   Lyithe17 November, 2013 at 2:11 pmLog in to Reply

   This is sooo useful!! Many thanks.

6. 

   forfiterszwagier18 May, 2013 at 12:26 pmLog in to Reply

   ok, but could you tell me what to do in case of such commutator: [p^2,x]?
   If possible, step by step?

7. 

   herrzyklon15 May, 2013 at 10:41 pmLog in to Reply

   Really good, thank you

8. 

   Tom Warren10 May, 2013 at 8:23 pmLog in to Reply

   does x hat acting on dell x phi x dell x phi?

9. 

   Tom Warren10 May, 2013 at 8:22 pmLog in to Reply

   why do they cancel … because on the lhs shouldn’t you have x hat (where
   hat denotes operator)dell x phi whereas on the rhs you have dell x (x phi)
   where we are thinking of x as a just x (because x hat phi = x phi). I did
   the same method as you and it looks nice to be able to do this but I
   couldn’t think why x hat dell x phi equalled x dell x phi?

10. 

    Mark T2 May, 2013 at 3:49 pmLog in to Reply

    Thank you! I’ve been searching around for some good QM videos. I think I
    might have a chance after all to leave this class with more than a passing
    grade… like a basic understanding of how “to do” QM.