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6.4 Radiation and waves
6.4 Radiation and waves
6.4 Radiation and waves
6.4 Radiation and waves
6.4 Radiation and waves
6.4 Radiation and waves
6.4 Radiation and waves
6.4 Radiation and waves
6.4 Radiation and waves
6.4 Radiation and waves
6.4 Radiation and waves
6.4 Radiation and waves
6.4 Radiation and waves
6.4 Radiation and waves
6.4 Radiation and waves
6.4 Radiation and waves
6.4 Radiation and waves
6.4 Radiation and waves
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6.4 Radiation and waves

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  • 1. 17 October 2010
    6.4 Radiation and waves
  • 2.
  • 3. Aims
    Show that light can be reflected, refracted, diffracted and produces interference effects
    Explain that we think sound is a wave
    Show that light can be reflected and refracted
  • 4. Light
    When light interacts with an object it can be either reflected (bounce off), transmitted (go through) or be absorbed (transfer energy)
  • 5. Reflection
    Absorption
    Transmission
  • 6. I think a light ray is a stream of tiny particles emitted by a source
    My experiment show that light rays can interfere. Two streams of particles could not do this. Light is a wave.
  • 7. Reflection
    Refraction
    Reflection is the change in direction of a wavefront at an interface 
    Refraction is the change in direction of a wave due to a change in its speed.
    Diffraction
    Interference
    Interference is the addition of two or morewaves that results in a new wave pattern. 
    Diffraction is the apparent bending of waves around small obstacles and the spreading out of waves past small openings.
  • 8.
  • 9.
  • 10.
  • 11.
  • 12. Demonstrations
    Does sound behave like a wave?
  • 13. Quantum weirdness
  • 14. Reproducing Young’s double slit experiment
    We are going to repeat Young’s experiment and derive a value for the wavelength of the laser light and compare with the printed value
    You first need to make your ‘double slit’
  • 15. What will happen?
    Sketch what you see with no card
    Sketch what you think you will see with the card
    Sketch what you actually see
    Why do you think this happens?
  • 16.
  • 17. What is the medium?

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