Activities of three radioactive substances A , B and C are represented by the curves A , B and C , in the figure. Then their half-lives T 1 2 A : T 1 2 B : T 1 2 C are in the ratio:

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Correct answer: C. 2 : 1 : 3

R = R 0 e - λ t ln R = - λ · nt + ln R 0 Slope = ln 2 t 1 / 2 = λ T 1 A : T 1 B : T 1 C = 2 : 1 : 3

Activities of three radioactive substances A , B and C are represented by the curves A , B and C , in the figure. Then their half-lives T 1 2 A : T 1 2 B : T 1 2 C are in the ratio:

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