1.

The count rate of a Geiger- Muller counter for the radiation of a radioactive material of half life of 30 minutes decreases to 5s−1 after 2 hours. The initial count rate was

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The count rate of a Geiger- Muller counter for the radiation of a radioactive material of half life of 30 minutes decreases to 5s1 after 2 hours. The initial count rate was



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