Two radioactive elements A and B has half lives of 100 and 50years. Samples of A and B initial contains equal numbers of atoms.What is the ratio of the remaining atoms of A to that of B after 200years?


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Question Number 52457 by Necxx last updated on 07/Jan/19

$T w o r a d i o a c t i v e e l e m e n t s A a n d B$ $h a s h a l f l i v e s o f 100 a n d 50 y e a r s .$ $S a m p l e s o f A a n d B i n i t i a l c o n t a i n s$ $e q u a l n u m b e r s o f a t o m s . W h a t i s$ $t h e r a t i o o f t h e r e m a i n i n g a t o m s$ $o f A t o t h a t o f B a f t e r 200 y e a r s ?$
	Answered by MJS last updated on 07/Jan/19

	$t = 000 A = 100 % B = 100 % A : B = 1 : 1$ $t = 100 A = 50 % B = 25 % A : B = 2 : 1$ $t = 200 A = 25 % B = 6 . 25 % A : B = 4 : 1$
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