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?

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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Question

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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