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A radioactive sample has N0 active at t ...

A radioactive sample has `N_0` active at `t = 0` . If the rate of disintegration at any time is `R` and the number of atoms is `N`, them the ratio `R//N` varies with time as.

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The correct Answer is:
D
`R= lamda N rArr (R)/(N)= lamda`
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