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| == Questions and answers about lectures or lecture notes == | ## page was renamed from Lecture == Questions and answers about lectures, lecture notes, or exam... == |
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| Question hello i'm reading through the lecture notes and i have some questions. first, what is meant by $\psi^*$? i think ive seen that before but i do not remember and its not in any of my notes. is it the wave function of a particle moving in the opposite direction as $\psi$? |
[[I think N. had a point]] |
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| Answer First of all, Kudos for reading and asking questions! $\psi^*$ is literally the complex conjugate of $\psi$. The physical meaning is actually exactly as you say! Moving in the opposite direction! A more correct way to say it is the time-reversed state. However, just knowing "complex conjugate" is fine at this point. Question also, is the hamiltonian operator just the energy of the system? i have never heard of it before this class. |
[[Coherence Length?]] |
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| Answer It could be that it was shown with the Schrodinger equation, and the meaning was not let known. TISE (time-independent Schrodinger equation): $H \psi = E \psi$. $H$ is the QM operator for energy. The eigenvalue of $H$ or the expectation value of $H$ is the energy. |
[[Midterm Distribution|Midterm Distribution and Other Info]] [[Parallel or Serial]] [[Wave function, Hamiltonian]] ---- [[Bibliography]] |