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Everything posted by Lizwi

  1. Lizwi


    I am failing to understand spin. I believe any object when rotated 360 degrees will return it faces to their original position. What does spin 1/2 and spin 3/2 mean?
  2. Why is NO3 called spectator ion because it can react with water to form HNO3 and turn water in OH- so the solution is neutral Thanks
  3. It seems like in University Physics textbook by Young and Freedman, the SE differential equation is not solved, The solution is only predicted and tested. Is it not possible to solve it?
  4. I am looking for good statistical physics and classical mechanics notes ,graduate level for self study.
  5. I was computing an expectation value of kinetic energy. Here the kinetic energy is the square of momentum divided by 2m. But when I square expectation value of momentum, the textbook return Psi unsquared Please see attachment.
  6. Thanks I will have a look on it, I am going through Griffiths QM textbook. I am at the beginning of it.
  7. Okay thanks a lot
  8. Thanks for your time now lastly, can you show me a small example where you shift the derivative from one factor to another changing the sign? or it’s just as in your first post?
  9. Mmmh okay. I see. Now for all computations in QM, shall I assume this?
  10. Ohhhhh! I can see 2 is cancelled as coefficient of m You equated the first integral to its complex conjugate??
  11. Please show me how to move from equation 1.30 to 1.31 I tried using integration by parts
  12. Lizwi


    How was the equation highlighted in the attachment below simplified. I get the other term but another highlighted term went to zero, how? The hand writing is where I tried using integration by parts. A’ = ih/2m
  13. Let’s say, the online university is overseas, is mailing still possible?
  14. Hi. I am a South African staying in South Africa, I can see that in order to study I science online, only overseas universities are available for online Msc (master of science) degree. my question is “ when I enroll, how do I get the Degree certificate. Thanks
  15. Can anyone hep me understand this solution I have attached both question and solution I can see the application of Fourier's law to the right hand side of the solution, but why is right hand side multiplied by area?, also to the left, what has happened to Ko. Thanks
  16. Hi, can anyone help me, I need a soft copy for Cosmology by Jayant Narlikar 2nd or third edition Thanks
  17. If you study degree online, like honours degree, how do you get certificate after completing?
  18. Yes, I understand the variables. Thanks, your explanation is very clear. I think I can classify PDEs now according to their linearity.
  19. For example Is the first equation linear or non linear?
  20. They said " Linear equation is the one in which there is no products of the dependent variable and its derivative.
  21. Hlw. Still I failing to understand the difference between Linear, semilinear and Quasilinear pde even after reading from Google. Can anyone clarify for me please.
  22. Lizwi

    Black holes

    Okay, thanks, the Sun is too small. Is there a general Shwarzchild radius for objects to become a black whole?
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