1.

Two radio isotopes A and B of atomic mass X and Y are mixed in equal amount by mass. After 20 days , their mass ratio is found to be 1:4. Isotope A has a half-life of 1 day. The half-life of isotope B is :

Answer»

`1.11 (Y)/(X)` DAYS
`0.11 (X)/(Y)` day
0.6237 day
1.10 day

Answer :D


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