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1. 1. 17 October 2010<br />6.4 Radiation and waves<br />
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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 />
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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 />
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17. 17. What is the medium?<br />