Chemistry: DeBroglie's Particle Wavelength Equation

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Because of the Heisenberg Uncertainty Principle, we know that Bohr's theory about electrons is incorrect. In 1924, De Broglie postulated that electrons are quantized, but, like light, they have wave properties. He determined that wavelength = Planck's Constant/momentum. This means that if you have 2 particles with equal masses traveling at different speeds, the slower particle will have the longer wavelength. And if you have 2 particles with different masses traveling at the same speed, the smaller particle will have the longer wavelength. Professor Harman explains the mathematics behind this and discusses Angstroms. In 1927, Davisson and Germer proved that particles (specifically electrons) have wave properties. Professor Harman explains the constructive and destructive interfence properties of waves to explain their experiment using crystals. Lastly, Professor Harman uses a guitar to explain standing waves, which produce quantized prequencies. This helps to explain that, because electrons also have quantized frequencies, they can only be found in specific energy levels.

Taught by Professor Harman, this lesson was selected from a broader, comprehensive course, Chemistry.

Dean Harman is a professor of chemistry at the University of Virginia, where he has been honored with several teaching awards. He heads Harman Research Group, which specializes in the novel organic transformations made possible by electron-rich metal centers such as Os(II), RE(I), AND W(0). He holds a Ph.D. from Stanford University.

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• particles
• wavelength
• chemistry
• debroglie
• uncertainty principle

[MrVizionary2012]

this just brought home everything I have been learning. Thank you so much!

[Marsc0met]

I would recommended BrightStorms: /watch?v=lDYMuzo40LU

[nightmindr]

cuts off right in the middle of him talking. Kind of defeats the purpose dont you think?