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Wave/Particle Duality

Wave/Particle Duality. Question: What happens if we repeat Young’s double slit experiment with a beam of electrons (particles) instead of light?. Answer: We still get an interference pattern!! Why? All particles exhibit “wave-like” properties!!!!!.

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Wave/Particle Duality

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  1. Wave/Particle Duality

  2. Question:What happens if we repeat Young’s double slit experiment with a beam of electrons (particles) instead of light? • Answer: We still get an interference pattern!! • Why? All particles exhibit “wave-like” properties!!!!!

  3. DeBroglie Wavelength λ = h/ph = 6.63x10-34 J*s • What is the DeBroglie wavelength of an electron moving at v = 3.5x106?

  4. What is the DeBroglie wavelength of a baseball (m = 0.15kg) moving at v = 13m/s?

  5. Question:If particles can act like waves can waves act like particles? • Answer: Yes!!!! (PhotoElectric effect, Compton Scattering)

  6. Photoelectric Effect • Einstein won his Nobel prize for it. He realized that light is made up of packets of energy (photons) • When light shines on a metal surface it can eject electrons from the metal, but only if the frequency is high enough. • Higher frequency means higher energy per photon. E = h f

  7. Photoelectric Effecthf = k Emax + Wo • Each photon emits one electron • Higher frequency means the electron is emitted with more KE (velocity). • If the minimum frequency is used KE = 0. • Higher Intensity means more overall energy but if the frequency is not great enough no electrons are ejected. • Higher intensity means more photons which can eject more electrons, but can’t give individual electrons more energy.

  8. What is the work function of a metal that requires a min. wavelength of 485nm to eject electrons from its surface?

  9. What is the velocity of an electron ejected by light of frequency 1.5x1015 Hz from a metal with a work function 4.1x10-19 J?

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