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Isotopes of oxygen with mass number less than 16 undergobeta^+ emission. Assumingan equimolar mixture of ""^14Oand ""^15O , find the ratio of the nuclides at the end of one hour. t_(1//2) for ""^14O= 71 s, t_(1//2) for ""^15O=124 s.At what time will the ratio of ""^14Onuclei to ""^15Onuclei be equal to 0.25? |
| Answer» SOLUTION :`3.02 XX 10^(-7) , 332 s ` | |