Lecture 4 - Topics for the day Administrative stuff...

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Topics for the day Administrative stuff Wave-Particle Duality Atomic Emission Rydberg equation The Bohr atomic model Administrative stuff Makeup exams Check in-class exam times and compare with your other classes and their exam times. Makeup request form is in the Exam Info part of BB Send it to Susan by next Wednesday (2/3) ALEKS prep chemistry assessment Finish the initial assessment by Wed (2/3) or you are out of the course! Note the last announcement on BB if you are retaking it. Administrative stuff TA office hours location change Mon noon – 1 pm (Cubicle B, Welch level 1) Wed 9 – 10 am (Cubicle C, Welch level 1) Fri 11 am - noon (Cubicle C, Welch level 1) DrRuth office hours start today Tue 2 – 3 pm, Wed 3:30 – 4:30 pm, Thu 9:30 - 10:30 am In my office WEL 3.153 You are always welcome to email either of us to arrange a meeting outside these times. 1 2 3
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Where were we? Planck explained blackbody radiation by saying Energy must be quantized. Einstein explained the photoelectric effect by saying Light sometimes behaves as particles, photons, each with quantized energy. The properties of light can only be explained if you attribute both wave-like and particle-like behaviour to electromagnetic radiation. The energy of a photon: hc λ = E = h ν h mv λ = de Broglie showed that all matter can exhibit wave-particle duality Wave-particle duality The wavelength of matter is inversely proportional to mass. Low mass (photons) more likely to observe wave behaviour. High mass (bullets) more likely to observe particle behaviour. Just the right mass (electrons) may see both behaviours. It all depends on whether we have an experimental way to observe the behaviour. Diffraction (wave property) occurs when the distance between scatterers (e.g., slits) is of the same order of size as the wavelength. To scatter light (e.g., 500 nm) we use slits around 1000 nm (1 μ m).
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