Recent content by CrimsonFlash

  1. CrimsonFlash

    Exchange symmetry when adding angular momentum and in LS coupling?

    Why does the problem only occur if we have the same subshell? Also, how do we know that these linear combinations that your wrote are eigenstates of the total orbital angular momentum? Thanks!
  2. CrimsonFlash

    Exchange symmetry when adding angular momentum and in LS coupling?

    When you add two angular momentum states together, you get states which have exchange symmetry i.e. the highest total angular momentum states (L = l1 + l2) will be symmetric under the interchange of the two particles, (L = l1 + l2 - 1) would be anti-symmetric...and the symmetry under exchange...
  3. CrimsonFlash

    Mean squared distance traveled by an unbiased random walker in 1-D?

    Hey! I've been doing some research on random walks. From what I have gathered, a random walker in 1-D will have: <x> = [FONT="Georgia"]N l (2 p - 1) σ =[FONT="Georgia"] 2 l sqrt[N p (1 - p) ] Here, N is the number of steps, p is the probability to take a step to the right and l is the step...
  4. CrimsonFlash

    What are the matrix elements of the angular momentum operator?

    The dirac delta is actually supposed to be all the way to the left. Sorry, that's the only picture I could find.
  5. CrimsonFlash

    What are the matrix elements of the angular momentum operator?

    What are the "matrix elements" of the angular momentum operator? Hello, I just recently learned about angular momentum operator. So far, I liked expressing my operators in this way: http://upload.wikimedia.org/math/8/2/6/826d794e3ca9681934aea7588961cafe.png I like it this way because it...
  6. CrimsonFlash

    Branch Cut for (lnz)^2: Determining Branch Points and Range

    Homework Statement It is simply the same as the one for lnz i.e. does it go from 0 to ∞? Also, is there any proper way to figure out branch points of a function? Homework Equations The Attempt at a Solution
  7. CrimsonFlash

    Contour integral of e^(-1/z) around a unit circle?

    Never mind, I got what I was looking for. Thanks anyway.
  8. CrimsonFlash

    Contour integral of e^(-1/z) around a unit circle?

    Ok, thanks everyone. Also, can you help me with the following: f(z) = sqrt(z)/(1+z^2) = sqrt(z)/[(i+z)(z-i)] The poles of this are at i and - i. The residues I calculate are: For i := sqrt(i)/(2i) = exp(πi/4)/(2i) For -i := sqrt(-i)/(-2i) = exp(-πi/4)/(-2i) Bur WolframAlpha says otherwise...
  9. CrimsonFlash

    Contour integral of e^(-1/z) around a unit circle?

    Homework Statement What is the integral of e-1/z around a unit circle centered at z = 0? Homework Equations - The Attempt at a Solution The Laurent expansion of this function gives : 1 - 1/z + 1/(2 z^2) - 1/(3! z^3) + . . . . . The residue of the pole inside is -1. So the integral...
  10. CrimsonFlash

    Calculating quality factor in a series LCR circuit?

    Max Energy: 0.5 C (V/ωRC)2 Energy lost per cycle: V2/2R x 2π/ω ...and this gives the correct value for Q. Thank you.
  11. CrimsonFlash

    Calculating quality factor in a series LCR circuit?

    I'll post the answers here : Q from the 1st bit: 1/R x (L/C)^(1/2) Q from my try: R x (C/L)^(1/2)
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