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Define decay constant...

Define decay constant

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Decay constant of a radioactive element is the reciprocal of the time during which the number of atoms left in the sample reduces to `1//e` times the original number of atoms in the sample.
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Define radioactive decay constant.

Define the term decay constant of a radioactive substance.

Knowledge Check

  • A radioactive nuclide can decay simultaneously by two different processes which have decay constant lambda_(1) and lambda_(2) . The effective decay constant of the nucleide is lambda

    A
    `lambda = lambda_(1) +lambda_(2)`
    B
    `lambda=(lambda_(1)+lambda_(2))//2`
    C
    `(1)/(lambda)=(1)/(lambda_(1))+(1)/(lambda_(2))`
    D
    `lambda =sqrt(lambda_(1)lambda_(2))`

  • A radioactive nuclide can decay simultaneously by two different processes which have decay constants lambda_(1) and lambda_(2) . The effective decay constant of the nuclides is lambda .

    A
    `lambda=lambda_(1)+lambda_(2)`
    B
    `lambda=(1)/(2)(lambda_(1)+lambda_(2))`
    C
    `(1)/(lambda)=(1)/(lambda_(1))+(1)/(lambda_(2))`
    D
    `lambda=sqrt(lambda_(1)lambda_(2))`

  • The activity of a radioactive elements (decay constant lambda ) becomes (1)/(3) of initial activity A_(0) in 9 years then the decay constant after 9 years will :

    A
    `lambda `
    B
    `lambda //3`
    C
    `lambda //9`
    D
    `2 lambda // 3`

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    The average life of a radioactive element is ............. of the decay constant.

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