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Q.

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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a

b

c

d

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.
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