Search results

  1. S

    Tunneling paradox

    So it is the probability density right? Cause that is what I want. If it isn't then how different would it be? student
  2. S

    Tunneling paradox

    Can you explain to me again, why what I have drawn is not the wavefunction but the probability density? I think it might be the wavefunction.....I am still confused. I think it should be the continuation of exponential decay when the wave emerges from the barrier for E < V and for E > V, I...
  3. S

    Tunneling paradox

    So something like this where the amplitude of the transmitted wave is reduced....its intensity is reduced.
  4. S

    Tunneling paradox

    Like this? Also, just wana clarify something, I know I am probably being pedantic but anyways...Is 50 % transmission is the same as R = T = 0.5? Cause the question asks for the probability density sketches for 50% transmission. I think 50% transmission is the same as R = T = 0.5...
  5. S

    Quantum mechanics in DIRAC notation

    This is the quantum harmonic oscillator where \hat a\dagger and \hat a are the step down and step up (SOMETIMES CALLED LADDER) operators according to your definitions. Correction: I think you meant to say \hat N = \hat a\dagger \hat a
  6. S

    Tunneling paradox

    So would the probability density look like this? The transmitted wave and reflected waves have a reduced amplitude...i.e. they are 1/2 of the original amplitude (incident amplitude). This is the plot of the probability density. Does it make sense? Looking forward to hearing from you soon...
  7. S

    Tunneling paradox

    Consider a Quantum Mechanical particle approaching a barrier (potential) of height V_0 and width a. What will the sketch of the probability density look like if there is a 50% chance of reflection and a 50% chance of transmission? Can you explain why cause after reading Griffith' s Quantum...
  8. S

    How to graph in Latex ?

    How do I plot graphs in LaTeX? Example sin(x) to begin with. :frown: Also, how do I insert pictures in LaTeX? Example, simple circuit diagrams. student :confused:
  9. S

    Diode output waveform

    Can you explain to me step by step how I would go about reasoning as to what it should look like?
  10. S

    Diode output waveform

    I have done clamping, clipping, half wave rectifier and full wave rectifier circuits. For the diagram, I think it is a cos wave with amplitude 10 V but have no idea why. I am genuinely lost here. student
  11. S

    Diode output waveform

    Sketch the output voltage as a function of time. The AC voltage source is V_{o}cos(\omega)t with V_{o} = 10V and \omega = 2000rad/sec. I have posted a diode circuit question in the attachment Ok, I think it should be a sine curve with a 10 V amplitude but am not too sure about the period...
  12. S

    Fourier integral / transform ? What is it really?

    If i multiple both sides by exp(-ik'x) the LHS gives exp(-ik'x-(x/2a)^2). I' m not sure what to do with this to simplify it further. Do i have to try to complete the square in this exponential now?
  13. S

    Calculation of Excitation potentialfrom I-V curve

    Plot distance along x axis versus peak number. calculate the slope using the method of least squares. Plot distance from 0th peak versus peak number. Calculate the slope as before. The ratio of the slopes gives the excitation potential. There is another method using the current just before...
  14. S

    Fourier integral / transform ? What is it really?

    Find phi(k) I need help with this question as far as what am I looking for and how do I use a Fourier transform cause I think I need one. student
  15. S

    Data Analysis web site for experiments ?

    Is there a site where I could see what people have done in various experiments? For example, I will be doing the verlocity of light experiment and would like to know what kinds of data analysis people have done so I can get some ideas as to what I could do with my data. Is there any such...
  16. S

    Particle in a BOX - what are allowed momenta?

    I know about that, but it depends on what the size of the box is. The only reason things worked out nicely to one expression was due to the fact that the box was centered at the origin and was of size L rather than what I have which is 2L. I think there was an expression relating energy to...
  17. S

    Franck Hertz questions

    I' m not very knowledgable on this issue....perhaps someone else can help ...I say excitation energy is the difference between peaks and subtract the potential at the location of the first peak to get the contact potential...WAIT for SOMEONE ELSE to back this up. student1938
  18. S

    Particle in a BOX - what are allowed momenta?

    Particle in a BOX -- what are allowed momenta? Ok I am trying to come up with the first five eigenfunctions for the particle in a box of size 2L. Now, I gave the appropriate initial conditions and get as a solution phi(x) = bcos(kx) + asin(kx). I said that phi(-L) = phi(L) = 0 which game me...
  19. S

    Lagrange' s eequations of a suspended set of rods

    Anything,,,I just wana finish this off please.
  20. S

    Lagrange' s eequations of a suspended set of rods

    So for the side rods, then it should just be l/2*omega ^ 2 right?
  21. S

    Lagrange' s eequations of a suspended set of rods

    oh did you use v = omega X r where r = l and the angle is 90 degrees.....now that makes sense. So then T = (1/2)*m*(l*omega)^2 and I can now use Lagrange' s Eqs right?
  22. S

    Lagrange' s eequations of a suspended set of rods

    Then it should just be l/t but then wht happens to t?
  23. S

    Lagrange' s eequations of a suspended set of rods

    the speed should just be d(lcos(theta))/dt right? I think thta lcos(theta) is the horizontal distance and we are dividing by time here to get speed right?
  24. S

    Lagrange' s eequations of a suspended set of rods

    For some reason, I am just unable to figure it out...according to me, based on the last hint, it should be (1/2)*m*(l*cos(theta))^2...I am saying l cos theta because that is the distance to the CM from the tip of the side rods.....does that make sense? Any suggestions?
  25. S

    Lagrange' s eequations of a suspended set of rods

    No wait the rod moves so there must be some KE....(1/2)*m*(dl/dtheta)^2 if you take it from the tip?
  26. S

    Lagrange' s eequations of a suspended set of rods

    So then KE is just (1/2)*I*omega^2. The bottom rod does not rotate so there is no KE like you said. IS that all that is needed for the KE? how would I get omega? I think that I should just leave it the way it is
Top