A radioactive sample S1 having an activity of 5µCi has a twice the nu – McqOptions

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1.	A radioactive sample S1 having an activity of 5µCi has a twice the number of nuclei as another sample S2 which has an acitivity of 10mCi. The half lives of S1 and S2 can be?
A.	20 years and 5 years, respectively
B.	20 years and 10 years, respectively
C.	10 years each
D.	5 years each
Answer» B. 20 years and 10 years, respectively

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