Recent content by budafeet57

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    Continuity and differentiability over a closed interval

    Thank you clamtrox. I am very rusty about the definition of continuity and differentiability, even I went back to my calc textbook, I still cannot figure out what I should do. Can you tell me what's wrong with my reasoning?
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    Continuity and differentiability over a closed interval

    Ah I see, b is the answer. Because f is not a constan, so it can only be linear. When it's differentiated it can't equal to zero under [-2,1].
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    Continuity and differentiability over a closed interval

    Homework Statement http://i.imgur.com/69BmR.jpg Homework Equations The Attempt at a Solution a, c are right because f(c) is continuous. b, d are right because f'(c) is differentiable over the interval I am not sure about e. Can anyone explain to me?
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    Rigid Box and 3D Schrodinger equation

    Hi Simon, I'll come back and think more after my coming exam.
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    Rigid Box and 3D Schrodinger equation

    Hi Simon, thanks for helping me again. wave equation is the schrodinger equation? and wave function is the solution?
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    Rigid Box and 3D Schrodinger equation

    Homework Statement An electron is confined within a three-dimentional cubic region the size of an atom where L = 200 pm. a) write a wave equation for the electron b) wirte a general wave function for the possbile states of the electorn. List any quantum numbers and their possible values...
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    Schrodinger equation for three dimention?

    Thanks. I was doing a problem: An electron is confined within a three-dimentional cubic region the size of an atom where L = 200 pm. and I remembered somehow, my teacher gave me these equation do they work in such condition?
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    Schrodinger equation for three dimention?

    I have learned time-independent schrodinger equation only from my textbook. I know Eψ(x) = - hbar^2 / 2m ψ''(x) + Uψ(x) and ψ(x) = Asinkx + B coskx what if it's three dimention? do I do Eψ(x, y, z) = - hbar^2 / 2m ψ''(x, y, z) + Uψ(x, y, z) ? and what is the wave equation supposed to be?
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    Two photons forms a particle

    I can define +x and +v to the right side and the 500MeV photon is heading to the right while the 200MeV photon is heading to the left. The final momentum of the particle P will have positive value, which indicates that it's moving toward the right. This is definitely what I should think of in...
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    Two photons forms a particle

    Thank you. direction of particle should be positive x direction because the head-on collision is 1D and velocity is positive.
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    1 Dimentional Schrodinger equation

    for part d, do I just do this?:
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    1 Dimentional Schrodinger equation

    Homework Statement Consider the one dimensional wave funciton give below. a) Draw a graph of the wave function for the region defined. b) Determine the value of the normalization constant c) what is the probability of finding the particle between x = 0 and x = a/2 d) show that the wave function...
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    Two photons forms a particle

    So instead I should use E^2 = (pc)^2 + (mc^2)^2 to get mc^2, and get K = E - mc^2, then v. now I get: mc^2 = 632 MeV K = 68 MeV v = 0.43c
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    Two photons forms a particle

    I see my problem after a nice sleep lol. I originally thought all energy from photon goes into creating the particle P, but because there's momentum left so that assumption was wrong and I cannnot use E = mc^2 where E is 700 MeV and thus m = 700MeV/c^2.
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