MCQOPTIONS
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| 1. |
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 [CBSE PMT 1995] |
| A. | 25\[{{s}^{-1}}\] |
| B. | 80\[{{s}^{-1}}\] |
| C. | 625\[{{s}^{-1}}\] |
| D. | 20\[{{s}^{-1}}\] |
| Answer» C. 625\[{{s}^{-1}}\] | |