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In the following distintegration ""(92)^...

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

Text Solution

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The correct Answer is:
6
8 `alpha` particles and `6 beta` particles
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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 x and y in above decay series are :

Total number of alpha and beta - particles emitted in nuclear reaction ""_(92)^(238)U to ""_(82)^(214)Pb is

Knowledge Check

  • During the transformation of ""^(b)X_(a) rarr ""^(d)Y_(c) the number of beta- particles emitted is :

    A
    `(b-d)//4`
    B
    `(c-a)+1//2(b-d)`
    C
    `(a-c)-1//2(b-d)`
    D
    `(b-d)+2(c-a)`

  • In an old rock, the mass ratio of ""_(92)^(238)U to ""_(82)^(206)Pb is found to be 595:103 . The age of the rock is (Mean life of ""_(92)^(238)U is T_(0) ) :

    A
    `T_(0)` In 1.2
    B
    `T_(0)` In `(698)/(595)`
    C
    `T_(0) ("In" 1.2)/("In2")`
    D
    `T_(0) ("In" (698)/(595))/(In 2)`

  • 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 :

    A
    5.25
    B
    0.125
    C
    12.5
    D
    1.25

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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 :

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