deontaejD6977 deontaejD6977

25-10-2022
Chemistry

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40k decays to 40ar with a half-life of 1.3 billion years. argon is a gas, so 40ar escapes into the atmosphere once it forms. suppose a sample of granite originally contained 20 g of 40k, but it now contains only 5 g. how many half-lives have passed? how old is the rock?

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