`._(92)^(235)U` decays with emission of `alpha` and `beta`- particles to form ultimately `._(82)^(207)Pb`. How many `alpha` and `beta`-particles are emitted per atom of Pb produced?

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

After a series of alpha and beta decays, ._94Pu^(239) becomes ._82Pb^(207) . How many alpha and beta particles are emitted in the complete decay process?

._(92)U^(238) is radioactive and it emits alpha and beta particles to form ._(82)Pb^(206). Calculate the number of alpha and beta particles emitted in this conversion. An ore of ._(92)U^(238) is found ot contain ._(92)U^(238) and _(82)Pb^(206) in the weight ratio of 1: 0.1. The half- life -period of ._(92)U^(238) is 4.5xx 10^(9) yr. Calculate the age of the ore.

._(90)^(234)Th disintegrates to give ._(82)^(206)Pb as the final product. How many alpha and beta particles are emitted in this process?

._(90)^(232)Th disintegrates to ._(82)^(208)Pb . How many of beta -particle are evolved?

._(90)Th^(234) disintegrates to give ._(82)Pb^(206)Pb as the final product. How many alpha and beta particles are emitted during this process ?