The half life period of a radioactive element \( x \) is same as the mean life time of another radioactive element \( y \). Initially they have the same number of atoms. Then:
\( x \)-will decay faster than \( y \)
\( y \)-will decay faster than \( x \)
\( x \) and \( y \) have same decay rate initially and later on different decay rate
\( x \) and \( y \) decay at the same rate always
