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The background count rate in a laboratory is 10 counts/min.
The measured count rate from a radioactive source is 410 counts/min, which includes the
background.
The half-life of the source is 5 days.
What is the measured count rate after 15 days?
A 10 counts/min
B 50 counts/min
C 60 counts/min
D 110 counts/min
what is the answer? plz explain!
 
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