Lessons 26-31 Relativity and Quantum theory
Lesson #26 Chapter 26 Light
Maxwell's Equations video (1st 15 minutes) Taking the basic laws of electricity and magnetism he show that all electromagnetic waves (including visible light) travel at a speed of 300,000,000 m/s through space. First 15 minutes of Maxwell's equations #39 All of Optics video #40 |
Check Yourself (All ) Summary of Terms and Summary of Formulas: Review Questions (look over all)
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Lesson #27 Chapter 29 light waves (focus on interference from single and double slits and thin films) We will not be discussing polarization Came up with a formula to explain spectral lines of hydrogen atom. |
Check Yourself (All ) Summary of Terms and Summary of Formulas: Review Questions (look over all) Double slit experiment ~1802 confirming interference of light waves. |
Lesson #29 Chapter 31 Light quanta Chapter 32 The atom and the quantum |
Check Yourself (All ) Summary of Terms and Summary of Formulas: Review Questions (look over all) JJ Thompson discovers electron (1899) 1900 Planck's Constant h=6.63x10-34 J-s (a.k.a. very tiny) Made the first use of the theoretical idea that energy came in packets (quantum, quanta) Energy= h * frequency E = h f Photoelectric effect or from phetRutherford Atom (~1910) notes or from phet (Rutherford atom was unstable as it would continuosly give off light) Neils Bohr (~1913) Models of the hydrogen Atom or from phet see video #49 at MechanicalUniverse see video #50 at MechanicalUniverse elctron wave in Bohr atom (click on wave model and select quantum n=5) (BU physics 2nd semester Modern Physics de Broglie) Heisenberg's Uncertainty Principle Equations " It is impossible to precisely and simultaneously know where an object is and where it is going " (R.M. MacKay) Schroedinger's Wave equation Resource Simulation
(BU physics 2nd semester Modern Physics Probability density cloud) |
Lesson #31 Chapter 35 Special Relativity
Wednesday class. watch videos #41 and #44 from Mechanical Universe Series |
Check Yourself (All ) Summary of Terms and Summary of Formulas: Review Questions (look over all)
Michaelson Morley Experiment see video #41 at
MechanicalUniverse
timeDilation
tD2 (moving clocks run slowly)
lengthContraction (moving lengths are shorter in direction of motion and unaltered in directions perpendicular to the motions) Simultaneity (the concept of when events are simultaneous depends on ones reference frame) see video #42 at MechanicalUniverse
see video #43 at
MechanicalUniverse
Relative speeds add differently and can never be faster than the speed of light. Light travels a 300,000,000 m/s (3x108 m/s) as viewed by all reference frames.
E=mc2
1 g of matter =0.001 kg conbining with 1 g of antimater would create 0.002 kg worth of energy. E=(0.002 kg)(3x108 m/s)2 = 18x1013 Joules see video #44 at MechanicalUniverse CalTechFun |