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Number of beta particles emitted during ...

Number of `beta` particles emitted during the decay of `""_(92)^(235) U` to `""_(82)^(207)Pb`

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The correct Answer is:
4
`""_(92) U^(235) to ""_(82) Pb^(207) + a(""_(2) alpha^(4)) + b(""_(-1) beta^(0)) , a = ((235-206)/(4)) = 7 alpha`
`92 = 82 + (2 xx 7) - b , b = 14 + 82 - 92 = 14 - 10 = 4 beta`
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