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InterviewSolution
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8g of the radioactive isotope, cesium -137 were collected on February 1 and kept in a sealed tube. On July 1, it was found that only 0.25 g of it remained. So the half-life period of the isotope isA. 37.5 daysB. 30 daysC. 23 daysD. 50 days |
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Answer» Correct Answer - B t = Feb 1 to July 1 `= 28 + 31 + 30 + 31 + 30 = 150` days `lamda = (2.303)/(150) "log" (8)/(0.25) = (2.303)/(150) log 2^(5) = (0.693)/(30) "day"^(-1)` `t_(1//2) = (0.693)/(0.693//30)` = 30 days. |
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