The ratio of activities of two ratio niculides X and Y in a mixture at time `t=0` was found to be `4:1` After two hours, the ratio activities become `1:1` . If the `t_(1//2)` of radio nuclide X is 20 min then `t_(1//2)` [in mintes] of ratio nuclide Y is ,
a) 10
b) 20
c) 30
d) 40

Options

A. 10
B. 20
C. 30
D. 40

Answer

C