welcome to where the arts meet physics · 2018. 2. 1. · welcome to where the arts meet physics...
TRANSCRIPT
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Welcome to Where the Arts meet Physics
Course Website – (Under Construction)
Today
• Universe Wrap-up
• Quantum World
• Quantum Voyage Audition – tmrw
• Assignment details
• Project and presentation time
• Brain-storming
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The Quantum World
Condensed Matter, Ultra-Cold Atoms
Quantum superpositionDoes God play Dice?
Matter Waves
Bizarre States of Matter
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The Story of the Quantum
Exercise: Finding a good story
Inspiring representations (visuals, movement, etc)
Bringing alive the quantum world
Understanding quantum paradoxes and philosophy
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Birth of Quantum Physics(Early 1900’s)
Blackbody radiation
Pure Electromagnetic theory
suffered ‘Ultraviolet catastrophe’
Radiated light can only have
discrete amounts of energy
that depend on frequency
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Planck relation
Energy of a photon
E = h⨯f
f – frequency (Hz; per sec)h – Planck’s constant
6.6⨯10-34 Joules-sec4.1⨯10-15 eV-sec
Recall: c = L⨯f
Speed of light - c: 3⨯108 meters/sec
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Photoelectric effect
Einstein, Nobel Prize, 1921Photoelectric effect
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Particle or wave?
It depends!(always one or another)
E.g. Wave interference and Photon imaging
Two-slit interference
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If light can behave as a particle….
1924, PhD thesis
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If light can behave as a particle…. maybe particles can behave as waves!!
1924, PhD thesis
Wave-particle
duality
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Wave description of matter
Erwin Schrodinger
1926 – makes waves!
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Schrdinger’s Equation
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Two-slit Interference
Behavior similar to light waves!
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For the two-slit interference experiment to work, a single electron must
A. randomly go through one slit or another.
B. go through one slit or another in synch with other electrons.
C. go through both slits at once.
D. None of the above
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For the two-slit interference experiment to work, a single electron must
A. randomly go through one slit or another.
B. go through one slit or another in synch with other electrons.
C. go through both slits at once. – Bizarre consequence of quantum physics!!!!
D. None of the above
“Buckyball”
Electron diffractionBuckyball
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What kind of wave?
Wave of probability!!
Particle is in a ‘superposition’ of many places at once…….
Copenhagen Interpretation
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Which ‘probabilistic’ scenario is a direct consequence of quantum physics?
A. The outcome of rolling a dice in Las Vegas
B. An object exists in many places at once with some probability
C. Predicted chance of rainfall today
D. All of the above
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Which ‘probabilistic’ scenario is a direct consequence of quantum physics?
A. The outcome of rolling a dice in Las Vegas
B. An object exists in many places at once with some probability
C. Predicted chance of rainfall today
D. All of the above
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Wave of probability!!
Particle is in a ‘superposition’ of many places at once….until….it is observed!
Probability and chance in the deepest sense
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Applications of quantum superposition include A. Schrodinger’s cat
B. Magnetic resonance imaging
C. Cryptography and Computation
D. All of the above
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Applications of quantum superposition include A. Schrodinger’s cat
B. Magnetic resonance imaging
C. Cryptography and Computation
D. All of the above
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Schrodinger’s cat
A radioactive element can be in a superposition of decayed and undecayed –affects the state of the cat
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Superposition of spinsSimultaneously point up and down
Magnetic Resonance Imaging
Quantum Computation
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Quantum Information and Cryptography
Quantum Entanglement (Spooky actions at a distance…); EPR paper
Philosophical; Applied
Govt and quantum encryption
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Electron Quantum Waves
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Quantum particle in a box
Picture: waves and strings
Only some wavelengthsEnergy ‘quantized’; E = hf
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Quantum Tunneling
Ability to get through classically forbidden barriers
Light/Matter acting as a wave
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Quantum Tunneling
Photon tunneling
Radioactive Decay
Scanning TunnelingMicroscope
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The Atom
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Democritus, 460 BCIndivisible bit of matter
J.J. Thomson, 1897Electron – Cathode Ray tubePlum Pudding Model
Rutherford, Early 1900sAlpha rays on gold foilModel having nucleus
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Quantum models of atoms
Schrodinger’s description
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Hydrogen atom energy levels
𝐸𝑛 = −𝟏𝟑. 𝟔𝒆𝑽
𝒏𝟐
1electron-Volt (eV) = 1.6⨯10-19 Joules
Different atoms have different energy levels
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Atoms and light
Atomic spectra
Each atom/element has its fingerprint spectrumLight from stars!! Much more!!
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Two kinds of quantum particles
FermionsElectron, proton, etc
Exclusion
BosonsH atom, photons, etc
(also, even # of fermions)
‘Communal’
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Atoms and crystals
In some materials, electrons can hop from atom to atom
E.g. Copper
Several states with energies very close
Crystal
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Conductors, semi-conductors, insulators
‘Hopping’ electrons occupy lowest energy states
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Current electronics
and much more……
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Diodes and TransistorBased on combining semiconductors having different band gaps
Diode: one-way current
1947: Shockley, Bardeen, Brattain
Transistor: amplifies signals(Valve analogy)
Transistors
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Bosons – friendly behavior
Bosons
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LaserLight Amplification by Stimulated Emission of
Radiation
Laser Cap
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Laser application
Surgery Barcoding Optical disc drive CD/DVD
Controlled fusion, and more…..
Laser-Speaker
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Bose-Einstein condensation
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www.chemistryland.com/
Exciting new states of matter:
Superconductors,
Superfluids
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Properties of Superconductors
Resistivity
Temperature
Zero Resistance
(“Friction free”)
www.physics.ubc.ca/~outreach
Repels magnetic fields
(“Perfect diamagnet”)
Focus.aps.org
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Currents and Magnetic Fields
A changing magnetic field can
induce a current in a wire
E.g. AC power supply
The induced current opposes
the magnetic field
Lowering temperature lowers
the resistance of metals.
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Understanding Superconductivity
“Bardeen-Cooper-Schreiffer
theory”:
Cooper pairs are the key!
Bardeen and the quad
The Cooper Pair Dance
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www.chemistryland.com/
Superconductors:
Perfect diamagnets
Levitation
Levitation
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The Quantum World
Condensed Matter, Ultra-Cold Atoms
Quantum superpositionDoes God play Dice?
Matter Waves
Bizarre States of Matter
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Assignment 1
ASSIGNMENT 1: DREAMING BIG – Due by email to Smitha and Karmela by Feb 2
Thinking through what scientific topics you might want to explore and what projects and collaborations you
might want to form; getting started on the creative flow.
Blurb (minimum 250 words):
Please write down i) a few ideas for what kinds of projects you might be interested in ii) what expertise you can
bring in (even if you have to pick it up now), iii) what scientific concepts you would want to focus on, and iv)
what components your ideal team would have based on the current talent (e.g. physics expert on .., music
creator, costume designer, etc).
Creative fragment (spend a minimum of 15min):
Imagine you were to start what you propose above, play with it, and record what comes out. Maybe a sketch,
points for a story, an audio clip, an installation, a description of some physics/science that inspires you, be it
through words or equations….. There are no constraints on the medium (bring it to the next class if you can't
send by email, but mention what it will be in your email).
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Quantum Voyages
Synopsis: Guided by Sapienza, the spirit of knowledge, two voyagers enterthe microscopic realm of everyday human experience. As in epic and fairy tales, thevoyagers explore land after land, each tickling the viewer’s imagination and, unlikefairy tales, offering glimpses of a world we believe actually resides around us. The trioconfront terrifying prospects of being Dead and Alive at once, encounter electronsacting as waves, are pelleted by photons, glide through diaphanous orbitals of atoms,precess in Magnetic Resonant Imaging machines, levitate above superconductingsurfaces, and navigate disordered quantum within us and the affirmation that thingsare never what they seem.
Latrelle Bright
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