Sunday, April 12, 2009

Syllabus

Students learn to:

Students:

1. Increased understandings of cathode rays led to the development of television

  • explain why the apparent inconsistent behaviour of cathode rays caused debate as to whether they were charged particles or electromagnetic waves
  • perform an investigation and gather first-hand information to observe the occurrence of different striation patterns for different pressures in discharge tubes
  • perform an investigation to demonstrate and identify properties of cathode rays using discharge tubes:
    – containing a maltese cross
    – containing electric plates
    – with a fluorescent display screen
    – containing a glass wheel

    – analyse the information gathered
    to determine the sign of the charge
    on cathode rays

  • solve problem and analyse information using:

    F=qvBsintheta

  • F=eV

  • V=ED


  • explain that cathode ray tubes allowed the manipulation of a stream of charged particles
  • identify that moving charged particles in a magnetic field experience a force
  • identify that charged plates produce an electric field
  • describe quantitatively the force acting on a charge moving through a magnetic field

  • discuss qualitatively the electric field strength due to a point charge, positive and negative charges and oppositely charged parallel plates
  • describe quantitatively the electric field due to oppositely charged parallel plates
  • outline Thomson's experiment to measure the charge/mass ratio of
    an electron
  • outline the role of:
    – electrodes in the electron gun
    – the deflection plates or coils
    – the fluorescent screen

    in the cathode ray tube of conventional TV displays and oscilloscopes
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I come from a Science family: My father Geoffrey Hill was Australia's first computer programmer on CSIRAC the fourth computer in the world. He is credited with invention of Computer music and the development of “Interprogram” a language before Basic. My PhD is in Atomic and Molecular Physics. I have researched the activated oxygen layer above the ozone layer, and 'Assigned' the world's smallest molecule. At the University of Toronto I researched high power UV lasers. I have specialized in automation in fibre optics. This developed into research in Machine Intellect and Robots. I have enjoyed work as an Explainer with Questacon and my time as a part-time soldier. I currently teach High School Science at Epping Boys’ High.