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  3. The mean lives of a radioactive sample are 30 years and 60 years for a-emission and b-emission respectively.

. The mean lives of a radioactive sample are 30 years and 60 years for a-emission and b-emission respectively.

The mean lives of a radioactive sample are 30 years and 60 years for a-emission and b-emission respectively. If the sample decays both by a-emission and b-emission simultaneously, the time after which, only one-fourth of the sample remain is

The mean lives

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The mean lives

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