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What are some examples of when waves are useful and harmful?

  1. May 18, 2013 #1
    1. The problem statement, all variables and given/known data

    What are some examples of when waves are useful and harmful?

    3. The attempt at a solution

    The examples for helpful I have so far are sound waves that allow us to communicate with one another and radio waves that enables us to use WiFi and cellphones. However I am not too sure about radio waves because they are electromagnetic waves and in the textbook it states that all vibrations require a medium to transfer waves, but electromagnetic waves do not require a medium so I am unsure about radiowaves. I also added that waves are an efficient form of transferring energy : sound, radiation, and thermal.

    The examples for harmful I have so far are seismic waves that cause earthquakes and tsunamis and sound waves that can be a nuisance at times.
     
  2. jcsd
  3. May 18, 2013 #2

    HallsofIvy

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    So what? The question was about waves, not "vibrations".

     
  4. May 18, 2013 #3
    Think again about seismic waves and earthquakes: what is really the cause and the effect here?
     
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