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4 June, 17:07

Radon-222 decays at a continuous rate of 17.3% per day. How much will 480 mg of Radon-222 decay to in 8 days?

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  1. 4 June, 20:18
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    At the end of each, the amount remaining is (1 - 0.173) = 0.827 times the amount at the beginning of the day. After 8 days, the amount remaining is

    ... (480 mg) * 0.827^8 ≈ 105 mg
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