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| 1. |
Isotopes of oxygen with mass number less than 16 undergo beta^+emission. Assuming an equimolar mixture of ""^14Oand ""^15O,find the ratio of the nuclides at the end of one hour. Given that t_(1//2) (""^14O) = 71 s and t_(1//2) (""^15O) = 124 s . At what time will the above said ratio be equal to 0.25? |
| Answer» SOLUTION :`3.29 XX 10^(-7) , 332 s` | |