Dear S2-04,
I have shown you a few video clips today. If you are interested, you can go to the following links:
(a) Sound in air VS sound in vacuum:
http://www.youtube.com/watch?v=_ckjttBin58
http://www.youtube.com/watch?v=bSEXt_S4BuE&feature=related
http://www.youtube.com/watch?v=b8VNs5vIbPA&feature=related
(b) Longitudinal waves - rarefractions and compressions
http://www.youtube.com/watch?v=Si-OYX20FRs&feature=related
Discussion questions posted on the whiteboard:
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