A sample of polonium-210 starts out with an activity of, Physics

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A sample of polonium-210 starts out with an activity of

Question: A sample of polonium-210 starts out with an activity of 2000 Bq (decays/s). The half life of polonium 210 is 139 days. If you measure the activity 357 days later,

Part A- what activity will you measure?

Please explain the equations and steps are used to get the answer. Thanks!

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Physics: A sample of polonium-210 starts out with an activity of

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Physics: A sample of polonium-210 starts out with an activity of

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