2. Key Concepts of Modern Physics in the Physics 30 Curriculum correlated with the Pearson Text Physics - quick overview of applets correlated with these concepts

4. Chapter 14: The wave-particle duality reminds us that sometimes truth really is stranger than fiction! –The quantum: »The Photoelectric Effect »The Compton Effect »The Wave-Particle Duality

5. Chapter 15: Electric force and energy quantization determine atomic structure –Quantization and Structure: »The discovery of the electron »Quantization of charge »The discovery of the nucleus »Interaction of photons and matter »The Bohr model

6. Chapter 16: Nuclear reactions are among the most powerful energy sources in nature –The Nucleus »Binding energy »Nuclear stability – nuclear decay »Nuclear energy

7. Chapter 17: The development of models of the structure of matter is ongoing –The “Deep Structure” of matter: »The cloud chamber »Particle accelerators »The Standard model

8. About the Applets… Most are Flash-based (several are JAVA) Most have an exploratory structure All can be used as demo, many as extended lab/exercises with a consistent “look-and-feel” Applets can be downloaded and help, assumptions, lessons customized to your needs

9. Chapter 14: The wave-particle duality reminds us that sometimes truth really is stranger than fiction! –The quantum: »The Photoelectric Effect »The Compton Effect »The Wave-Particle Duality

10. The Photoelectric Effect A curious twist – discovery of the photoelectric effect occurred in Hertz’s confirmation of the one of the greatest achievements of classical physics Lenard (1902) and Millikan (1916) refined and extended the analysis of the PE Thomson’s discovery of the electron emerged from a common source A great irony – Millikan’s adamant doubt of Einstein’s quantum of light hypothesis was silenced by his own experimental genius! Who is responsible for the idea of quantization of light On a Heuristic Viewpoint Concerning the Production and Transformation of Light (1905)

11. The Photoelectric Effect What was “non-classical” about it? –Curious relation between photoemission, frequency and intensity –Emission rates “all wrong!” Cut-off frequency and Work Functions Experimental evidence for the quantum hypothesis

12. Compton Effect The unequivocal “proof” for many physicists Could be used to demonstrate nature of science and role of evidence

13. The Wave-Particle Duality Introduces the heart of quantum physics One of the most abstract and challenging concepts Introduces indeterminacy and probabilistic ideas Feynman’s “sum over all histories” approach offers intriguing pedagogical possibilities

14. Sum over all histories – (a digression) How a photon goes from A  B in the quantum world

15. The Double-Slit “Paradox”

16. Chapter 15: Electric force and energy quantization determine atomic structure –Quantization and Structure: »The discovery of the electron »Quantization of charge »The discovery of the nucleus »Interaction of photons and matter »The Bohr model

17. Discovery of the Electron The “first” subatomic particle Critical step in understanding atomic structure Applet can be used in demo/exercise/lab mode One of the great experiments of the late 19 th century

18. The Bohr Model A semi-classical model No orbits! A good point at which to discuss models in science A simple and relatively successful model for Hydrogen and Hydrogenic atoms Extension to angular terms or more complex atoms not plausible (JAVA applet) Those who are not shocked when they first come across quantum mechanics cannot possibly have understood it.

19. Chapter 16: Nuclear reactions are among the most powerful energy sources in nature –The Nucleus »Binding energy »Nuclear stability – nuclear decay »Nuclear energy

20. Binding Energy Von Weizacker’s Semi-empirical Formula Strong interaction term “bonding” = 15.56 MeV Surface area correction term = 17.23 MeV Coulomb repulsion term = 0.697 MeV Asymmetry term = 23.285 MeV protons neutrons

21. Chapter 17: The development of models of the structure of matter is ongoing –The “Deep Structure” of matter: »The cloud chamber »Particle accelerators »The Standard model

22. The Cloud Chamber The “telescope” of particle physics Pre-requisite knowledge: – hand rules and magnetic interaction Charged particle – magnetic field interaction Hand rules and motion of charged particles in magnetic fields