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

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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