Question: Use the exponential decay model, A = A 0 e kt , to solve Exercises 2831. Round answers to one decimal place. The half-life of

Use the exponential decay model, A = A₀e^kt, to solve Exercises 28–31. Round answers to one decimal place.

The half-life of thorium-229 is 7340 years. How long will it take for a sample of this substance to decay to 20% of its original amount?

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First find the decay equation 05ekt 05e 7340k In 05 In e In 05 7340k In 05 7340k k 73400000094 A e 0000094t Next use the decay equation answer question Ae0000094t 02 e00000941 In 02 0000094 In 02 In e In 020000094t 0000094t t In 05 A e 7340 t171217 It will take 171217 years For greater accuracy use k In 05 7340 ... View full answer

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