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  • Define the term ‘Half-life’ of a radioactive substance. Two different radioactive substances have half-lives  and <img alt="T_{2}" src="https://lear

Define the term ‘Half-life’ of a radioactive substance.

Two different radioactive substances have half-lives T_{1} and T_{2} and number of
undecayed atoms at an instant, N_{1} and N_{2}, respectively. Find the ratio of their activities at that instant.

 

 

 
 
 
 
 

Answers (1)

Half-life is the time interval in which the number of radioactive nuclei is disintegrated to half of the initial value.

\frac{R_1}{R_2}=\frac{\lambda_1N_1}{\lambda_2N_2}\\\text{where }R_1 \ and\ R_2 \ \text{are activities}

\frac{R_1}{R_2}=\frac{N_1/T_1}{N_2/T_2}=\frac{N_1T_2}{N_2T_1}

 

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Safeer PP

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