question_answer

A radioactive material decays by \[\beta \]- particle emission. During the first 2 seconds of a measurement, \[n\beta \]-particles are emitted and in the next 2 seconds 0.75 \[n\beta \]- particles are emitted. Calculate the mean-life (in sec) of this material in seconds to the nearest whole number. \[(\ell n\text{ }3=1.0986\text{ }and\text{ }\ell n\text{ }2=0.6931).\]

Answer:

6.95