NEET Physics Nuclei Questions Solved

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

(a) 0.230 per minute             (b) 0.461 per minute
(c) 0.691 per minute             (d) 0.922 per minute

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