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Three samples of a radioactive substance...

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

0.086886574074074

B

0.04380787037037

C

0.29516203703704

D

data insufficient

Text Solution

Verified by Experts

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