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Factor physics question

  1. Oct 10, 2005 #1
    for the following question:
    show that the thickness x of an absorber required to reduce the intensity of radiation by a factor of 2 is given by x=0.693/(miu)

    my problem:
    what is meant by "a factor of 2"?
     
  2. jcsd
  3. Oct 10, 2005 #2

    Tide

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    It means that the energy is reduced to one half its starting value. BTW - 0.693 looks suspiciously close to [itex]\ln 2[/itex]. ;)
     
  4. Oct 10, 2005 #3
    thanks!!! :)
    so usually, factor=mutiple?
     
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