Question 9 The radioactivity of a 99mTc sample is measured 94 mCi at 5:00 PM. What time was it prepared if the initial activity was 200 mCi? The half life of 99mTc is 6 hours. O 10:35 PM O 10:28 AM O 2:10 PM O 4:52 PM O 12:56 PM Question 10 The radioactivity of a sample of sodium (24Na) is reduced from 880 mCi to 420 mCi in 16 years. Calculate the decay constant. O 0.046 year1 O 11.835 year1 O 28.750 year1 O 21.631 year O 0.020 year1
Question 9 The radioactivity of a 99mTc sample is measured 94 mCi at 5:00 PM. What time was it prepared if the initial activity was 200 mCi? The half life of 99mTc is 6 hours. O 10:35 PM O 10:28 AM O 2:10 PM O 4:52 PM O 12:56 PM Question 10 The radioactivity of a sample of sodium (24Na) is reduced from 880 mCi to 420 mCi in 16 years. Calculate the decay constant. O 0.046 year1 O 11.835 year1 O 28.750 year1 O 21.631 year O 0.020 year1
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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Transcribed Image Text:Question 9
The radioactivity of a 99mTc sample is measured 94 mCi at 5:00 PM. What time was it
prepared if the initial activity was 200 mCi? The half life of 99mTc is 6 hours.
O 10:35 PM
O 10:28 AM
O 2:10 PM
O 4:52 PM
O 12:56 PM
Question 10
The radioactivity of a sample of sodium (24Na) is reduced from 880 mCi to 420 mCi in 16
years. Calculate the decay constant.
O 0.046 year1
O 11.835 year1
O 28.750 year1
O 21.631 year
O 0.020 year1
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