Question

8.
Two radioactive materials X1 and X2 have
decay constants 10lambda and lambda respectively. If
initially they have the same number of nuclie,
then the ratio of the number of nuclie of X, to
that of X, will be l/e after a time :-
(1) (1/10lambda)
(2) (1/11lambda)
(3) (11/10lambda)
(4) (1/9lambda)​

Answer 1

Answer:CORRECT ANSWER IS (D)

Explanation:

Solution:

Nx1(t)Nx2(t)Ie

N0e−10λtN0e−λt=Ie

(Initially, both have same number of nuclei say N0)

or  e=eλt/e−10λt  or e=e9λt

or $$9\lambda t=1 or $t=\frac{1}{9\lambda}$

Answer 2

Answer:

hope this will help you.....