question_answer

 A and B are the two radioactive elements. The mixture of these elements show a total activity of 1200 disintegrations/minute. The half life of A is 1 day and that of B is 2 days. What will be the total activity after 4 days? Given: The initial number of atoms in A and B are equal.                  

A)  200dis/min      

B)  250 dis/min

C)  500 dis/min       

D)  150 dis/min