28.3 Physics 6C DeBroglie Uncertainty

28.3 Physics 6C DeBroglie Uncertainty - Physics 6C De...

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Unformatted text preview: Physics 6C De Broglie Wavelength Uncertainty Principle Prepared by Vince Zaccone For Campus Learning Assistance Services at UCSB De Broglie Wavelength Prepared by Vince Zaccone For Campus Learning Assistance Services at UCSB Both light and matter have both particle and wavelike properties. We can calculate the wavelength of either with the same formula: mv h p h = = λ For large objects (like a baseball) this wavelength will be far too small to measure, but for tiny particles like electrons or neutrons, we get wavelengths that are easily detectable in the lab. Example: Electrons are accelerated across a potential difference of 100 Volts. Find the wavelength of the electrons. The mass of an electron is 9.11x10 31 kg. Compare the energy of these electrons to the energy of photons of equal wavelength. Prepared by Vince Zaccone For Campus Learning Assistance Services at UCSB Example: Electrons are accelerated across a potential difference of 100 Volts. Find the wavelength of the electrons. The mass of an electron is 9.11x10 31 kg. Compare the energy of these electrons to the energy of photons of equal wavelength. Prepared by Vince Zaccone For Campus Learning Assistance Services at UCSB J 10 6 . 1 eV 100 KE 17 electron- ⋅ = = First thing to realize is that the electron picks up some kinetic energy as it accelerates across the potential difference (1 eV of energy for each volt). Example: Electrons are accelerated across a potential difference of 100 Volts....
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28.3 Physics 6C DeBroglie Uncertainty - Physics 6C De...

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