The activity of a radioactive sample is measured as 9750 counts per mi – McqOptions

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1.	The activity of a radioactive sample is measured as 9750 counts per minute at t = 0 and as 975 counts per minute at t = 5 minutes. The decay constant is approximately [CBSE PMT 1997]
A.	0.230 per minute
B.	0.461 per minute
C.	0.691 per minute
D.	0.922 per minute
Answer» C. 0.691 per minute

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