CLASS NOTES: http://www.public.asu.org/rjjacob/quantum.html
R J Jacob – Professor Emeritus of Physics
One Liner Notes and Brief Summary Statements
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- Quantum Physics is the study of the LAWS of Quantum Mechanics
- Quantum Tunneling is responsible for the fusion of protons
- Super Positioning (eg MRI) is the same object spinning in both directions at the same time
- Light can be particles and waves at the same time
- Principles of Scientific Communication
- – 1. Start in the right place. Ask questions. Err on the side of caution.
- – 2. Don’t go too far at one time. Let things soak in. Say a few things, then stop.
- – 3. Clarity beats accuracy. (eg) egg whites bonding – bit of oil – like your hands in grease
- – 4. Explain why it is cool.
- Photons – Wave Particle Duality
“Photos do not interfere with each other, they interfere with themselves”
- – 1. Particles
- – 2. Waves
- – 3. Quantum Interference
- Back and Forth: Momentum, Energy, Wavelength, Frequency
- Quantum Mechanics Symmetries (See Angular Momentum far below)
– Conservation of Momentum (no regard to origin)
– Conservation of Angular Momentum (no regard to orientation)
– Conservation of Energy (no regard to time dependency)
c = fλ – – – – f = c/λ
What he meant is demonstrated by the two waves shown at the right:
As the wavelength increases, the frequency decreases.
As the wavelength decreases, the frequency increases.
in .
Things to Research
Research from Class 2:
- Research: Spooky Physics
- The Quantum Challenge by George Greenstein – Quantum Foundations
- Dance of the Photons by Anton Zeidinger (really good)
- The Physics of Quantum Information – about Cryptography
- Speakable and Unspeakable in Quantum Mechanics by Bell
- Wave Functions and Probabilities
- Read abstracts and summaries of papers
- Subscribe to Physics Bulletin – Academy of Physics
- Physical Review Letters – Publication
- Wave functions – made up of compatible observable operators
- Mathematical functions
- Lyman, Balmer and Paschen Series
- Q will or Q will not – Probability
- P will or p will not
- Will and Will Not must equal ONE
- Priori probability – theoretical
- posteriori – probability – empiracle / experimental
- Classical Thermodynamics – Pressure / Temperature
- Quantum Theory – Values of observables – Transition Rates
- Electron changing shells – Balmer Series
- Quantum Transitions
- Probability of Transitions – Decay depens on initially
- time interval – quantum decay
- Radioactive Particles are either ON or OFF
- Radioactive decay – a particle does not become less radioactive,
- it simply ceases to exist at a particular timeAmpere’s Law – Electro magnetism
- Zeeman Effect – weak field
- 1925 San Goudsmit & George Uhlenbeck
- 1922 – Otto Stern & Walther Gerlach
- FERMIONS – Fermi and Duraq
- BOSONS – Einstein and Bose
- 1/2 SPIN – Electron, Proton, Neutron, Quark – He3 atom
- Ingeger SPIN – Photon, Pion, Glion, Hydrogen Atom, alpha Particle
- Fermi and Duraq – Statistics
- Indistinguishable Particles
- – Classical, easily remedied.
Research from Class 3:
- Pauli Exclusion Principle
- Maxwell – Boltzmann Statistics
- Atoms – Molecules – Nuclei
- Orbit – Not shells as we learned in the 70s, but rather as wave functions.
- Isotopes – Hydrogen, Deuterium, Tritium
- FOUR FUNDAMENTAL FORCES OF NATURE
- Gravity – Weak attraction – 10
- Electromagnetic – Stronger – 10^2 (137 to be exact)
- Weak Nuclear – Slightly stronger – 10^30
- Strong Nuclear – Very strong – 10^40
IsoSpin Mirror Image
- Quantum Tunneling – Probability
- Quantum Entanglement – Diodes
- Shrodinger’s Cat
Scanning Tunneling Microscope
Pi Meson – Look at decay and zero spin
Total spins must be zero – check out quantum cryptology.