The isotope 90 39Y undergoes b- decay with a half-life of 64.0 h. You measure an activity of 8.0 x 1016 Bq. (a) How many 90 39Y nuclei are present in the sample at the time you make this measurement? (b) How many will be present after 12.0 days?
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The isotope 90 39Y undergoes b- decay with a half-life of 64.0 h. You measure an activity of 8.0 x 1016 Bq. (a) How many 90 39Y nuclei are present in the sample at the time you make this measurement? (b) How many will be present after 12.0 days?
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