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A experiment is done to determine that h...

A experiment is done to determine that half life of a radiactive substance that emits one beta particle of each decays process Measurements show that an average of 8.4 beta particles are emitted each second by 2.5 milligram of the substance. The atomic weight of the substance is 230. Find the half life of the substance.

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