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Initially the earth was a fire-ball, slo...

Initially the earth was a fire-ball, slowly it has cooled to form earth crust and its different layers. At the beginning `""_(92)^(238)U` was present and no `""_(82)^(206)` Pb was there. With the passage of time, uranium decayed to `""_(82)^(206)Pb` The decay process is : ` ""_(92)^(238)U underset((x alpha, y beta))to ""_(82)^(206)Pb , t_(1//2)` of `""^(238)U = 4.5 xx 10^(9)` yrs
x and y in above decay series are :

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Initially the earth was a fire-ball, slowly it has cooled to form earth crust and its different layers. At the beginning ""_(92)^(238)U was present and no ""_(82)^(206) Pb was there. With the passage of time, uranium decayed to ""_(82)^(206)Pb The decay process is : ""_(92)^(238)U underset((x alpha, y beta))to ""_(82)^(206)Pb , t_(1//2) of ""^(238)U = 4.5 xx 10^(9) yrs A sample of rock from south America contains equal number of atoms of ""^(238)U and ""^(206)Pb . The age of the rock will be :

Initially the earth was a fire-ball, slowly it has cooled to form earth crust and its different layers. At the beginning ""_(92)^(238)U was present and no ""_(82)^(206) Pb was there. With the passage of time, uranium decayed to ""_(82)^(206)Pb The decay process is : ""_(92)^(238)U underset((x alpha, y beta))to ""_(82)^(206)Pb , t_(1//2) of ""^(238)U = 4.5 xx 10^(9) yrs Atomic mass of ""^(238)U is 238.125 amu. Its packing fraction will be :

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The total no. of alpha and beta - particles emitted in the nuclear reaction : ""_(92)^(238)U to ""_(82)^(214)Pb

In the following distintegration ""_(92)^(238)U to ""_(82)^(206)Pb + ........ , number of beta - particles emitted is