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Two radioactive material A(1) and A(2) h...

Two radioactive material `A_(1)` and `A_(2)` have decay constants of 10 `lambda_(0)` and `lambda_(0)`. If initially they have same number of nuclei, then after time `(1)/(9 lambda_(0)) ` the ratio of number of their undecayed nuclei will be

A

`1/e`

B

`1/e^(2)`

C

`1/e^(3)`

D

`sqrt(e)/1`

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The correct Answer is:
A
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Knowledge Check

  • Two radioactive material A_(1) and A_(2) and decay constant of 10lambda_(0) and lambda_(0) . If initially they have same number of nuclei, then after time (1)/(9lambda_(0)) the ratio of number of their undercayed nuclei will be:

    A
    `(1)/(e)`
    B
    `(1)/(e^(2))`
    C
    `(1)/(e^(3))`
    D
    `(sqrt3)/(1)`

  • Two radiactive material A_(1) and A_(2) have decay constants of 10 lambda_(0) and lambda_(0) . If initially they have same number of nyclei, the ratio of number of their undecayed nuclei will be (1//e) after a time

    A
    `1/(lambda_(0))`
    B
    `1/(9lambda_(0))`
    C
    `(1)/(10lambda_(0))`
    D
    `1`

  • Two radioactive materials X_(1) and X_(2) have decay constants 10 lambda and lambda respectively. If initially they have the same numbers of nucle, then the ratio fo the nclie of X_(1) to that X_(2) will be 1//e after a time:

    A
    `(1)/(10lambda)`
    B
    `(1)/(11 lambda0`
    C
    `(11)/(10lambda)`
    D
    `(1)/(9lambda)`
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