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Problem
Problem
The ratio of activities of two radio nuclides X and Y in a mixture at time
t
=
0
t = 0
t
=
0
was found to be 4 : 1. After two hours, the ratio of activities become 1 : 1. If the
t
1
/
2
t_{1/2}
t
1/2
of radio nuclide X is 20 min then
t
1
/
2
t_{1/2}
t
1/2
[in minutes] of radio nuclide Y is:
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