Question

Which one among the following is the mean life of radioactive elements?

• A. Equal to half-life
• B. Less than half-life
• C. $0.693t\frac{1}{2}$
• D. $1.44t\frac{1}{2}$

Answer 1

The correct option is D $1.44t\frac{1}{2}$

1.44t1/2 is the mean life of radioactive elements.

in radioactivity, average lifetime of all the nuclei of a particular unstable atomic species. This time interval may be thought of as the sum of the lifetimes of all the individual unstable nuclei in a sample, divided by the total number of unstable nuclei present. mean life in British. noun. physics. the average time of existence of an unstable or reactive entity, such as a nucleus, elementary particle, charge carrier, etc; lifetime.