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3. A radioactive substance is known to decav at a rate proportional to the amount present. If initially there is 100 milligrams of the substance

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3. A radioactive substance is known to decav at a rate proportional to the amount present. If initially there is 100 milligrams of the substance present and after two hours it is observed that the substance has lost 10% of its original mass, Find the time at which the material has decayed to one half of its initial mass

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