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the half life of a certain substance is 25 years. How long will it take for a sample of this substance to decay to 90% of its original amount ...?
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the half life of a certain substance is 25 years. How long will it take for a sample of this substance to decay to 90% of its original amount ...?

User Obiwanjacobi
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1 Answer

7 votes
10% = 1/2 ^n
*where n is number of half lives to reach 10%

n = ln10/ln2

and multiply by 25 gives 83.05 years to 2dp

Hope this helps
User Pagep
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