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1.a.
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1.b.
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of its radioactivity? 255 How many half-lives have passed when a radioactive substance has lost 256 - number of half-lives
19 The half-life of 45K is 18 minutes. If you have a sample containing 2.5 x 103 micrograms (ug) of this isotope at noon, how many micrograms will remain at 3 o'clock in the afternoon? Hg 45K 19 Submit Show Tutor Steps
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