The alpha activity of a 10 kg sample of ...

The alpha activity of a `10 kg` sample of `._(92)U^(235)` that is used in a nuclear reactor is found to be `x xx 10^(-8)` Bq. If the half of life of uranium -`235` for emitting alpha particles is `7.04xx10^(8)` year, then find the value `'x'`. (Given 1 year `=3.15xx10^(7)s`)

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