1.

Three samples of a radioactive substance have activity in a ratio 2 : 5 : 7 , then after two half lives the ratio of their activities will be:A. 0.086886574074074B. 0.04380787037037C. 0.29516203703704D. data insufficient

Answer» Activity after time t
`A=lambdaN_(0)e^(-lambdat)`
`A=lambdaA_(i)`
`A=lambda` (initial activity)
`A prop` initial activity


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