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

1) 25${s^{ - 1}}$

2) 80${s^{ - 1}}$

3) 625${s^{ - 1}}$

4) 20${s^{ - 1}}$

Solution:

Explanation: No Explanation

Radioactivity Modern Physics

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