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Physics Modern Physics Level: High School

Radioactivity

The half-life of 131-I is 8.04 days . Three days after it was prepared , its activity was 0.5 microCi, How many curies (in microCi) were initially prepared ?

a) 8.60

b) 3.70

c) 0.65

d) 0.055

e) 0.0039