[" A radioactive sample decays by "beta" -emission.In first "],[" two seconds 'n' "beta" -particles are emitted and in next "],[2" seconds,'0."25n'beta" -particles are emitted.The "],[" half life of radioactive nuclei is "]

A radioactive sample decays by ' beta -emission. In first 2 seconds, n beta -particles are emitted and in next 2 seconds, 0.25 n beta -particles are emitted. The half life of radioactive NUCLEI (in second) is

A radioactive element decays by beta- emission. A detector racords n -beta particles in 2 sec and in next 2 sec it records 0.65n -beta particles. Find mean life.

A radioactive element decays by beta- emission. A detector racords n -beta particles in 2 sec and in next 2 sec it records 0.65n -beta particles. Find mean life.

A radioactive element decays by beta -emission. A detector records n-beta particles in 2 s and in next 2 s it records 0.45 n beta particles. Find mean life.

A radioactive element decays by beta -emission. A detector records n-beta particles in 2 s and in next 2 s it records 0.45 n beta particles. Find mean life.

beta -particle is emitted in radioactivity by

A radioactive element decays by beta-emission . A detector records n beta particles in 2 s and in next 2 s it records 0.75 n beta particles. Find mean life correct to nearest whole number. Given ln |2| = 0.6931 , ln |3|=1.0986 .