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  3. 3 a radioactive sample has mass 128 kg after two...

Question: 3 a radioactive sample has mass 128 kg after two...

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3. A radioactive sample has mass 128 kg after two hours and mass 2 kg after five hours. (a) What is the initial mass of the sample? (b) When will the sample mass decay to 1 kg? Express the answer in simplest form.
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