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Question

The ratio of molecular mass of two radioactive substance is 32 and the ratio of their decay constant is 43. Then the ratio of their initial activity per mole will be


A

2

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B

89

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C

43

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D

98

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Solution

The correct option is C

43


Activity R=λN. Number of nuclei (N) per mole are equal for both the substances R λ or R1R2=λ1λ2=43


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