A radioactive element disintegrates for a time interval equal to its mean life. The fraction that has disintegrated is

A certain radioactive element disintegrates for an interval of time equal to its mean life. What fraction of the element has disintegrated?

A certain radioactive element disintegrates for an interval of time equal to mean life. What fraction of element disappears? What fraction of element is left?

A certain radioactive sample decays for a time period equal to its mean life . Find (i) the fraction of the sample that disintegrates and (ii) the fraction of the sample that remains intact.

The probability that a certain radioactive atom would get disintegrated in a time equal to the mean life of the radioactive sample is

During mean life of a radioactive element, the fraction that disintegrates is

During mean life of a radioactive element, the fraction that disintegrates is

During mean life of a radioactive element, the fraction that disintegrates is