17 October 2010<br />6.4  Radiation and waves<br />
Aims<br />Show that light can be reflected, refracted, diffracted and produces interference effects<br />Explain that we t...
Light<br />When light interacts with an object it can be either reflected (bounce off), transmitted (go through) or be abs...
Reflection<br />Absorption<br />Transmission<br />
I think a light ray is a stream of tiny particles emitted by a source<br />My experiment show that light rays can interfer...
Reflection<br />Refraction<br />Reflection is the change in direction of a wavefront at an interface <br />Refraction is t...
Demonstrations<br />Does sound behave like a wave?<br />
Quantum weirdness<br />
Reproducing Young’s double slit experiment<br />We are going to repeat Young’s experiment and derive a value for the wavel...
What will happen?<br />Sketch what you see with no card<br />Sketch what you think you will see with the card<br />Sketch ...
What is the medium?<br />
6.4 Radiation and waves
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6.4 Radiation and waves

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6.4 Radiation and waves

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

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