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Quantities describing time-dependent phenomena measurable initially?

  1. Sep 3, 2009 #1
    I've been thinking about a physics problem where one can determine information about a time-dependent phenomena from looking at some quantity at one instance in time. (I'm not talking about a conserved quantity such as energy.) In my case, we are considering a wave problem and the quantity is an analogue of the quality factor or Fermi's golden rule, both of which measure the rate of decay of energy in time. What are other examples in physics, chemistry, engineering or anywhere of such quantities?
     
  2. jcsd
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