1.

A radioactive element .A decays into another element .B. with decay constant 4lamda, which them decays into a third element .C. (decay constant =9lamda). If all the atoms in the begining consisted of type .A. only then the ratio of number of atoms of A to that of type .Bis maximum (i.e. N_(A)//N_(B) ) when the number of atoms of .B. is maximum ( N_(B)is maximum)

Answer»

`(3)/(2)`
`(9)/(4)`
`(1)/(1)`
`(ln3)/(LN2)`

Answer :B


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