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IB Physics 12

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IB Physics 12 Mr. Jean February 5th, 2014 The plan: Video clip of the day. Quantum Theory Energy Levels Some Definitions: Radiation - Electromagnetic Waves (EMR ... – PowerPoint PPT presentation

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Title: IB Physics 12


1
IB Physics 12
  • Mr. Jean
  • February 5th, 2014

2
The plan
  • Video clip of the day.
  • Quantum Theory
  • Energy Levels

3
Some Definitions
  • Radiation - Electromagnetic Waves (EMR) wave
    consisting of oscillating electric and magnetic
    fields that move at the speed of light through
    space.
  • Quantum a discrete amount of energy.
  • Quantized a property of a system that occurs
    only in multiples of a minimum amount.

4
  • Photoelectron electrons emitted in the
    photoelectric effect.
  • Photoelectric Effect the emission of electrons
    when electromagnetic radiation falls on an
    object.
  • Incandescent body object that emits light
    because of its high temperature.

5
Quantum Theory Introduction
  • In the early part of the twentieth century,
    Einstein's Theory of Relativity and the Quantum
    Theory shook the world of physics.
  • Einstein's Theory of Relativity was theorized in
    a year but the Quantum Theory required almost 3
    decades to unfold.

6
Quantum Theory (Modern Physics)
  • By the 1890s, scientists could not explain two
    troubling phenomena by using traditional
    Newtonian physics and the wave theory of
    electromagnetic waves (classical physics).

7
Black Body Radiation
  • A blackbody is a "perfect radiator" - it will
    emit a complete spectrum of electromagnetic
    radiation.
  • Objects that normally give off no radiation
    (appear black) can be made to do so by heating
    them. As the energy added to them increased, the
    type of radiation emitted changed.
  • However, at a certain temperature and frequency
    (ultraviolet range) the graph and experimental
    data did not continue to produce the expected
    results.

8
Black Body Radiation
  • http//www.youtube.com/watch?vjbxty6aDfhU

9
Demonstration (CH-9)
  • Demonstration 9.1
  • Physics Folder

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12
  • Kirchhoff needed a mathematical relationship. He
    could not determine the relationship so he
    challenged other scientists to come up with one.
    It was very complex.
  • When physicists applied classical physics
    theories, the graph obtained was not what was
    happening experimentally.

13
  • In 1900, Max Planck, did mathematically calculate
    the observed spectrum of radiation ONLY if he
    assumed that the vibrations of atoms could only
    have specific frequencies. According to Planck,
    the energy given off by atoms was E nhf where
  • n an integer 0, 1, 2..
  • f frequency of vibration of atom
  • h mathematical constant
  • h Planck's constant 6.63x10-34 J/Hz or Js
  • energy could only be specific values like hf,
    2hf, 3hf, etc.

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17
Check out this website Black Body Spectrum
  • http//phet.colorado.edu/en/simulation/blackbody-s
    pectrum
  • http//www.brightstorm.com/science/physics/the-ato
    m-and-quantum-physics/blackbody-radiation/

18
Plancks Atoms
  • E nhf
  • n an integer 0, 1, 2..
  • f frequency of vibration of atom
  • h mathematical constant
  • h Planck's constant 6.63x10-34 J/Hz or Js

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22
  • What Planck was essentially saying was that
    energy emitted or absorbed by atoms is QUANTIZED
    or exists in packages (bundles) of energy in
    specific sizes.

23
BBC Clash of the Titans
  • 17 40 minutes
  • History an experiments which were the origin of
    Quantum Theory

24
Photo Electric Effect
25
Photo Electric Effect
  • http//www.youtube.com/watch?vlTxs1usXSmk

26
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