AP Enviro half life isotopes

timer Asked: Sep 10th, 2015

Question description

At the end of two half lives, what fraction of the atoms had not decayed? 

Total number of skittles to begin with was 100. 


Half life 0= 0 seconds, 0 undecayed atoms and 0 decayed atoms.

Half life 1= 20 seconds, 60 undecayed atoms, and 40 undecayed atoms. 

Half life 2= 40 seconds, 40 undecayed atoms, 20 decayed atoms.

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