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Radioactivity

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Title: Nuclear Physics and Radioactivity Author: MPS Last modified by: Westwood High School Created Date: 1/5/2011 2:07:17 AM Document presentation format – PowerPoint PPT presentation

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Title: Radioactivity


1
Radioactivity
2
Radioactivity Particles are emitted from an
unstable nuclei.
ß
3
Nuclear Equations
4
The time taken for the activity, or the number of
atoms remaining, to fall by half is called the
half-life
5
(No Transcript)
6
Modified Graph lnN vs time
7
Equations
A the activity in becquerels (Bq) at time t A0
the original activity of the sample ?N
number of disintegrations ?t time interval N0
the original number of atoms in the sample. N
the number of atoms remaining after time t ?
the decay constant e mathematical constant
8
Deriving the half-life equation
9
  • Example A sample of radioactive isotope
    originally contains 1.0 x 1024 atoms and it has a
    half-life of 6.0 hours. Find
  • The decay constant
  • The initial activity
  • The number of atoms remaining after 12 hours
  • The number of atoms remaining after 30 minutes
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