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Questions  >>  JEEMAIN and NEET  >>  Physics  >>  Class12  >>  Atoms
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If ratio of molecular masses of two radioactive substances is $\;\large\frac{1}{2}\;$ and ratio of decay constant is $\;\large\frac{5}{3}\;$ . Then ratio of their initial activity per mole will be

$(a)\;\large\frac{4}{3}$$\qquad($$b)\;\large\frac{5}{3}\qquad($$c)\;$$3\qquad(d)\;\large\frac{2}{3}$

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