The mean lives of a radio-active substances are 1620 years and 405 years for α–emission…
Physics · JEE Advanced · NTA Exams — Atoms and Nuclei
The mean lives of a radio-active substances are 1620 years and 405 years for α–emission and β–emission respectively. Find Out the time during which three-fourth of a sample will decay if it is decaying both by α–emission and β–emission simultaneously.
- 324 years
- 449 years
- 480 years
- 425 years
Answer
(B) 449 years
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