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After 42 days a 2.0 g sample of phosphorus-32 contains only 0.25 g of the isotope. What is the half-life of phosphorus-32?
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After 42 days a 2.0 g sample of phosphorus-32 contains only 0.25 g of the isotope. What is the half-life of phosphorus-32?

User Jkhadka
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2.0 g 1.0g 0.5g 0.25g
3 and a half lives = 42 days
User Mscrivo
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