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Homework Help: Uncertainty Principle and kinetic energy

  1. Feb 18, 2010 #1
    1. The problem statement, all variables and given/known data
    Hey everyone. I've been trying to figure out these two problems for a few hours now to no luck. I really have no idea where to start. Hopefully, someone can help me out.

    1) a) How much time is needed to measure the kinetic energy of an electron whose speed is 10.0 m/s with an uncertainty of no more than .1%? How far will the electron have traveled in this period of time? b) Make the same calculations for a 1.0g insect whose speed is the same. What do these sets of figures indicate?

    2) An unstable elemtary particle called the eta meson has a rest mass of 549 MeV/c^2 and a mean lifetime of 7.00x10^-19s. What is the uncertainty in its rest mass?
  2. jcsd
  3. Feb 18, 2010 #2


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    Homework Helper

    Start by listing out all relevant equations, like the uncertainty principle.
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