1.

Activity of a radioactive substance is A_(1) at time t_(1) and A_(2) at time t_(2)(t_(2) gt t_(1)) , then the ratio of f(A_(2))/(A_(1)) is:

Answer»

`E^(LAMBDA(t_(2)+t_(1)))`
`e^(lambda(t_(1)-t_(2)))`
`e^(-lambda(t_(1)+t_(2)))`
`(t_(2))/(t_(1))`

Answer :B


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