Multiple Choice
A drug containing
with an activity of 2.00 Ci is to be injected into a patient at 11:00 am.A sample is prepared 4.00 hours before the injection (at 7:00 am) .The activity of the drug have at the preparation time (7:00 am) was 3.16 Ci.What is the mean lifetime of
?
A) 6.05 hr
B) 8.74 hr
C) 12.6 hr
D) 7.45 hr
E) 6.91 hr
Correct Answer:

Verified
Correct Answer:
Verified
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