1.

._(89)Ac^(231) " given " ._(82)Pb^(207) after emission of some alpha and beta particles. The number of such alpha and beta-particles are respectively

Answer»

5, 6
6, 5
7, 5
5, 7

Solution :Number of `ALPHA-"particles" = (231 -207)/(4) = 6`
Number of `beta-"particles" = 2xx 6 - 89 + 82`


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