question_answer

The half-life period of a radio-active element X is same as the mean life time of another radio-active element Y. Initially they have the same number of atoms. Then

A) X and Y decay at same rate always

B) X will decay faster than Y

C) Y will decay faster than X

D) X and Y have same decay rate initially

Correct Answer: C

Solution :

According to question, Half life of X, Now, the rate of decay is given by Y will decay faster than X.