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Homework Help: Physics for people with colds

  1. Dec 10, 2005 #1
    I have a cold and need to gargle. I put a tsp of table salt into a waterglass, add warm water and stir. I immediate hear the ting-tang pitch of the spoon-hitting-glass slowly lowering as I stir. The solution is now cloudy. As I continue to stir the pitch now rises back to its beginning point as the solution begins to clear.

    Why?
     
  2. jcsd
  3. Dec 10, 2005 #2
    I should add ... I then tried the same (adding warm water, stirring) but without adding the table salt. There was no (or little) pitch change.
     
  4. Dec 10, 2005 #3
    Well, obviously it's the solid salt crystals changing the pitch. As you know, sound travels faster through solids than it does through water (well it usually does). I guess different materials also conduct (is that the right word?) different frequencies in different ways.
     
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