Multiple Choice
Calculate the time required for the activity of a 9.0-mCi sodium-25 source to decay to 7.0-mCi (the half-life of sodium-25 is 60.0 s) .
A) 22 s
B) 44 s
C) 0.029 s
D) 19 s
E) 9.4 s
Correct Answer:
Verified
Correct Answer:
Verified
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