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19-01-2018
Physics

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After 15 minutes, 30 g of a sample of polonium-218 remain unchanged. If the original sample had a mass of 960 g, what is the half-life of polonium-218?

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19-01-2018

If you start with 960 and cut it in half five times, you get exactly 30. So 15 minutes is 5 half lifes, and each half life is 3 minutes.

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