text()_(90)Th^(234) disintegrates to give  text()_(82)Pb^(206) as the final product. How many alpha and beta partic

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Q 2686180977.      text()_(90)Th^(234) disintegrates to give  text()_(82)Pb^(206) as the final product. How many alpha and beta particles are emitted during this process?
JEE 1986

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