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A Geiger Counter Placed Next to a Radioactive Sample Produces

Question 10

Multiple Choice

A Geiger counter placed next to a radioactive sample produces 200 counts per minute.One hour later,the Geiger counter reads 180 counts per minute.What is the half-life of the radioactive sample?


A) 1.1 hours
B) 6.6 hours
C) 9.0 hours
D) 9.5 hours
E) 10 hours

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