At a given instant, there are 25% undecayed radioactive nuclei in a sample. After 69.3 s, the number of undecayed nuclei reduces to 12.5%, the mean life time of the sample is

At a given instant, there are 25% undecayed radioactive nuclei in a sample. After 10 seconds the number of undecayed nuclei reduces to 12.5%, the mean life of the nuclei is

At a given instant there are 25% undecayed radioactive nuclei in a sample. After 10 s the number of undecayed nuclei reduces to 12.5%. Calculate (a) mean life of the nuclei, (b) the time in which the number of undecayed nuclei will further reduce to 6.25% of the reduced number.

At a given instant there are 25% undecayed rodioctive nuclei in sample After 10 s the number of undecyed nuclei reduces to 12.5 % calculate the mean life of the nuclei .

At a given instant, 60% of the radioactive nuclei in a sample are left undecayed. After 20 s, 85% nuclei have disintegrated , mean life of nuclei

How many atoms decay in one mean life time of a radioactive sample-

Radioactivity of 108 undecayed radioactive nuclei of half life of 50 days is equal to that of 1.2 xx 108 number of undecayed nuclei of some material with half life of 60 days Radioactivity is proportional to half-life.

A radioactive substance has 10^8 nuclei. Its half life is 30 s . The number of nuclei left after 15 s is nearly

In a sample of radioactive material, what percentage of the initial number of active nuclei will decay during one mean life ?

In a radioactive sample, the fraction of initial number of redioactive nuclie, which remains undecayed after n mean lives is

A radioactive sample undergoes decay as per the following gragp. At time t=0 , the number of undecayed nuclei is N_(0) . Calculate the number of nuclei left after 1 h . .