Polonium-208 is an alpha emitter with a half-life of 2.90 years. how many milligrams of polonium from an original sample of 2.00 mg will remain after 8.00 years? a) 0.147 mg b) 0.296 mg c) 0.725 mg d) 6.77 mg e) 1.90 mg.

The answer to your question is letter B.

Explanation:

Data

Polonium-208 half-life = 2.9 years

Original sample = 2 mg

Total time = 8 years

Process

                     Mass                  Time

                     2 mg                 0 years

                     1 mg                   2.9 years

                      0.5 mg              5.8 years

                      0.25 mg            8.7 years

The mass of sample must be between 0.5 and 0.25 mg, from the options given the only possible answer is letter B 0.296 mg

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