How many alpha and beta particles are em...

How many alpha and beta particles are emitted when uranium `._(92)^(238)U` decays to lead `._(82)^(206)Pb` ?

12,6

10, 4

8, 6

8,8

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The Uranium -238 decay series (also known as 4n+2 series. Can you tell why?) ends at a stable isotope .^(82)Pb^(206) . Lead -206 is found in a certain Uranium ore due to dissintegration of Uranium. (a) How many alpha and beta particles are emitted in the series decay of one ._(92)U^(238) nucleus into ._(82)Pb^(206) ? (b) what is the age of uranium ore if it now contains 8g of Pb^(206) for every 10g of U^(238) ? Hlaf life of U^(238) is 4.5 bilion year. [Take ln2=0.6930,ln(1.9243)=0.6546 ]

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