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2. Strontium-90 has a half-life of 28 years. If a sample was tested in 1980 and found to be emitting 240 counts/min, in what year would the same sample be found to be emitting 30 counts/min? how much of the original Sr-90 would be left?

2. Strontium-90 has a half-life of 28 years. If a sample was tested in 1980 and found to be emitting 240 counts/min, in what year would the same sample be found to be emitting 30 counts/min? how much of the original Sr-90 would be left?

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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1. Complete and balance these nuclear equations by supplying the missing particles: (a) 2713AI + 42HE (b) 2. Strontium-90 has a half-life of 28 years. If a sample was tested in 1980 and found to be emitting 240 counts/min, in what year would the same sample be found to be emitting 30 counts/min? how much of the original Sr-90 would be left? 3015P + + ?1H → 13,N + 'on
Transcribed Image Text:1. Complete and balance these nuclear equations by supplying the missing particles: (a) 2713AI + 42HE (b) 2. Strontium-90 has a half-life of 28 years. If a sample was tested in 1980 and found to be emitting 240 counts/min, in what year would the same sample be found to be emitting 30 counts/min? how much of the original Sr-90 would be left? 3015P + + ?1H → 13,N + 'on
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