Answers: 1
for the mass of thorium in a sample of to decrease by 
, two half lives 
to decrease by yet another 
that of the initial mass in the sample. Another half life  
. It happens that 
-sample to reach 
.
(
in this case) matches the desired ratio or percentage. An exponential decay formula (which naturally works for this question as well) is given below:
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The element thorium has a half life of 24 days and undergoes beta decay. calculate the time it would...
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