Quantum Chemistry and Spectroscopy - Quantum Chemistry 3.10 - Average Momentum

Short lecture on the expectation value of momentum. Physical properties are represented in quantum mechanics by linear, Hermitian operators. The expectation value (average value) of a physical property is the integral over all space of the complex conjugate of the wavefunction times the operator acting on the wavefunction. The average momentum of a particle in a box is zero (neither moving on average to the left or right). The average square momentum can be computed analogously. The variance in the momentum is the difference between the mean square value and the square of the mean value. The standard deviation (uncertainty) is the square root of the variance. The product of the uncertainty of position and momentum obeys the Heisenberg uncertainty principle for a particle in a box states. Notes Slide: http://i.imgur.com/QDjFq3U.png --- About TMP Chem --- All TMP Chem content is free for everyone, everywhere, and created independently by Trent Parker. Email: [email protected] --- Video Links --- Chapter Playlist: https://www.youtube.com/playlist?list=PLm8ZSArAXicL6ArmHxHxgugNNsSYYD3MW Course Playlist: https://www.youtube.com/playlist?list=PLm8ZSArAXicL3jKr_0nHHs5TwfhdkMFhh Course Review: https://www.youtube.com/playlist?list=PLm8ZSArAXicLTRn3cJyyU1TiU7n_Pp4X1 Other Courses: https://www.youtube.com/playlist?list=PLm8ZSArAXicIXArfap9Tcb8izqRPvE0BK Channel Info: https://www.youtube.com/playlist?list=PLm8ZSArAXicLlGO4Rvpz-D6vX8MFbOn4V --- Social Links --- Facebook: https://www.facebook.com/tmpchem Twitter: https://www.twitter.com/tmpchem LinkedIn: https://www.linkedin.com/in/tmpchem Imgur: https://tmpchem.imgur.com GitHub: https://www.github.com/tmpchem --- Equipment --- Microphone: Blue Yeti USB Microphone Drawing Tablet: Wacom Intuos Pen and Touch Small Drawing Program: Autodesk Sketchbook Express Screen Capture: Corel Visual Studio Pro X8