PhysicsEasy183×since 2002Q6081The half-life period of a ratio-active element XXX is same as the mean life time of another ratio-active element Y.Y.Y. Initially they have the same number of atoms. ThenAXXX and YYY decay at same rate alwaysBXXX will decay faster than YYYCYYY will decay faster than XXXDXXX and YYY have same decay rate initiallyCheck answerSkip