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4. Radioactive Radon: After 3 days a sample of radon-222 has decayed to 58% of its original amount. (a) What is the half-life of radon-222?

4. Radioactive Radon: After 3 days a sample of radon-222 has decayed to 58% of its original amount. (a) What is the half-life of radon-222? (b) How long will it take the sample to decay to 20% of its original amount

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