Chapter 30

# The momentum of a photon is p h the photon can

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Unformatted text preview: ne electron. Any photon energy beyond the work function value goes into kinetic energy of the ejected electron, up to a maximum value given by: KEmax = hf – ϕ (for hf > ϕ) 7. The momentum of a photon is p = h/λ. The photon can therefore exert forces on non ­photonic objects via reflection or absorption. 8. The de Broglie wavelength of an object with mass is λ = h/p. If an object’s wavelength is comparable to the size of a structure that it encounters, diffraction effects will be observable and important. 9. The Heisenberg Uncertainty Principle describes a minimum value of uncertainty for certain “conjugate” variables: Δt ΔE ≥ h/2π Δpx Δx ≥ h/2π Δpy Δy ≥ h/2π 10. Variables that are not conjugate are not limited by the uncertainty principle: Δpx Δy ≥ 0 Δpy Δx ≥ 0 Textbook exclusions: Example 30 ­1: You will not be required to understand quantum numbers. 30 ­4: Photon Scattering and the Compton Effect will not be covered. 30 ­5: Crystal Diffraction of X ­rays and Particles will not be covered. 30 ­7: Quantum Tunneling will not be covered. Fair game for the exam is anything in the book with the exception of the exclusions above, anything in the lecture notes (or from the lectures), and anything from any of the MP homework. Some exam questions will be quantitative and some will be conceptual. MP practice problem suggestions: All – the final exam may include any of the types of problems included in the homework....
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