A radioactive sample has N0 active atoms at t = 0. If the rate of disintegration at any time is R and the number of atoms is N, then the ratio R/N varies with time as
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answer is D.
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Detailed Solution
Rate R=-dNdt=λN0e-λt=λN ⇒RN=λ (constant)i.e., graph between RN and t, be a striaght line parallel to the time axis.