NEET Physics Nuclei Questions Solved

The count rate of a Geiger Muller counter for the radiation of a radioactive material of half-life 30 min decreases to 5 s-1 after 2 h. The initial count rate was [1995]

(1) 20 s-1             (2) 25 s-1             (3) 80 s-1              (4) 625 s-1

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