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Intro Page Designed by Fu-Kwun Hwang  


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Software Requirements


Android iOS Windows MacOS
with best with Chrome Chrome Chrome Chrome
support full-screen? Yes. Chrome/Opera No. Firefox/ Samsung Internet Not yet Yes Yes
cannot work on some mobile browser that don't understand JavaScript such as.....
cannot work on Internet Explorer 9 and below



Fu-Kwun Hwang - Dept. of Physics, National Taiwan Normal Univ.; lookang; leongster


Assume the number of radioactive nucleus is N(t) --- not yet decayed into daughter product.
Each nucleus has the same probability p (p<1) decayed into daughter product.
It means that dN(t)/dt= -p*N(t) , where dN(t) is the number of nucleus decayed into daughter product at time t.
The solution is N(t)=N0 e -pt = N0 e -(ln2/T0.5)) t where N(0) is total number of nucleus at time t.

Each box represents a nucleus.
This applet lets you set the probability for a nucleus to decay and watch how the number of decayed nuclei (color changed to RED)  increased with time t.




Other Resources

  1. lookang's blogpost about this JavaScript version
  2. by Fu-Kwun Hwang original Java version
  3. by Wolfgang Christian similar Java version


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