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Suppose a laboratory has a 31 g sample of polonium210. The halflife of polonium210 is about 138 days. How many halflives of polonium210 occur in 966 days? How much polonium is in the sample 966 days later?

966/138 = 7
7 halflives means that 1/128 of the original 31g remains. 
Suppose a laboratory has a 31 g sample of polonium210. The halflife of polonium210 is about 138 days. How many halflives of polonium210 occur in 966 days? How much polonium is in the sample 966 days later?

7:.24

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