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Find the half life of ""(238)U if one gr...

Find the half life of `""_(238)U` if one gram of `""^(238)U` emits `1.24 xx 10^4 alpha`-particles per second. Avogardro No. `= 6.025 xx 10^(23)`.

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The correct Answer is:
`4.53 xx 10^(10)` years
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