1. Tardigrade
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  3. Physics
  4. The mean lives of a radioactive substance are 1620 years and 405 years for α -emission and β -emission respectively. The time during which three-fourth of a sample will decay if it is decaying both by α -emission and β -emission simultaneously is

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Q. The mean lives of a radioactive substance are $1620$ years and $405$ years for $\alpha$ -emission and $\beta$ -emission respectively. The time during which three-fourth of a sample will decay if it is decaying both by $\alpha$ -emission and $\beta$ -emission simultaneously is

Nuclei

Solution:

Correct answer is (b) 449 years