NEET Physics Nuclei Questions Solved

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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 (a) 20 s1 (c) 80 s-1 [1995] (b) 25 s-1 (d) 625 s

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