Wave Particle Duality

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Wave Particle Duality the Heisenberg
Uncertainty Principle

• By Nick Day, Edward Moore, Sarah Russell

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Wave particle duality (WPD)

• Both matter and electromagnetic radiation
  exhibit some properties of waves and some
  properties of particles. (McGraw-Hill)
• Matter sometimes acts like a wave, sometimes like
  a particle, depending on the experiment.
• Early development of quantum theory

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http//woodahl.physics.iupui.edu/Astro105/OLDindex
.html
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• Matter has dual nature duality
• Experiments show light seems to go only in a
  straight line particle nature. Experiments show
  that light has frequency and wavelength wave
  nature.
• 1909, Geoffrey Taylor double-slit experiment
  light is a wave. Special camera tool photos of
  the light exiting he experiment tiny pinpoints
  of light, light is a particle.

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Heisenberg Uncertainty Principle (HUP)

• The position and momentum of a particle cannot
  simultaneously measured with arbitrarily high
  position. (Hyperphysics)
• Particles momentum position cannot both be
  known at the same time.
• Result of wave particle duality

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photon
A particle can be seen only by scattering light
off it. The scattering changes the electron
momentum.
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• If particle momentum is measured, position will
  be changed.
• Bonus If energy of the particle is known, we
  cannot know length of time it has that energy
  (vise versa).
• Example http//science.howstuffworks.com/innovati
  on/science-questions/quantum-suicide2.htm

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• Star Trek Transporter Beams Take a person apart
  molecule by molecule, kept organized, reassembled
  elsewhere. HUP impossible to identify individual
  particles and keep track of them.

http//www.coolest-gadgets.com/20070607/beam-me-up
-scotty-scientists-make-breakthrough-with-trek-tra
nsporter-theory/
http//realityviews.blogspot.ca/2011/04/quantum-te
leportation-successful.html
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http//www.youtube.com/watch?vH-AlfuvjPYM
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Homework

• 1. The HUP states that a particle's _______ and
  
• ______ cannot both be known at the same time.
  2. A particle can be seen only by scattering
  light off
• of it. The scattering a) changes the size of
  the particle b) changes the mass of the
  particle c) changes the momentum of the
  particle d) all of the above3. What is wave
  particle duality?4. Define the Heisenberg
  Uncertainty Principle. 5. T/F? Only matter can
  have wave-like
• characteristics and particle-like
  characteristics.

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Corrections

• 1. position and momentum2. c) changes the
  momentum of the particle3. Matter sometimes acts
  like a wave,
• sometimes like a particle, depending on the
  experiment. 4. A particles momentum position
  cannot both be known at the same time.5. False,
  matter and electromagnetic radiation can have
  wave-like characteristics and particle-like
  characteristics.

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Sources

• http//simple.wikipedia.org/wiki/Wave-particle_dua
  lity
• http//hyperphysics.phy-astr.gsu.edu/hbase/uncer.h
  tml
• http//www.aip.org/history/heisenberg/p08.htm
• McGraw-Hill textbook
• Physics Principles and Problems textbook
• Physics Concepts and Connections textbook