1.

""_(92)^(238)U by successive radioactive decay changes to ""_(82)^(206)Pb. A sample of uranium ore was analysed and found to contain 1.0 gm of .^(238)U and 0.1gm of .^(206)Pb. Assuming that all the .^(206)Pb has accumulated due to decay of .^(238)U, find the age of the ore (half-life of .^(238)U=4.5xx10^(9)years).

Answer»


ANSWER :`7.098xx10^(8)` YEARS


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