MCQOPTIONS
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| 1. |
Initial mass of a radioactive element is 40 g. How many grams of it would be left after 24 years, if its half-life period is 8 years [MP PMT 1985] |
| A. | 2 |
| B. | 5 |
| C. | 10 |
| D. | 20 |
| Answer» C. 10 | |