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Disintegration constant of a radioactive...

Disintegration constant of a radioactive material is `lambda`:

A

Its half lif eequal to `(log_(e) 2)/(lambda)`

B

Its mean life equal to `1/lambda`

C

At time equal to mean life, 63% of the initial radioactive material is left undecayed

D

After 3-half lives, `1/3` rd of the initial radioactive material is left undecayed.

Text Solution

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The correct Answer is:
A, B
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Knowledge Check

  • Disintegration constant for a radioactive substance is 0.58 hr^(-1) . If half-life period

    A
    8.2 hr
    B
    5.2 hr
    C
    1.2 hr
    D
    2.4 hr

  • The half-life (T) and the disintegration constant (lamda) of a radioactive substance are related as

    A
    `lamda T = 1`
    B
    `lamda T = 0.693`
    C
    `(T)/(lamda) = 0.693`
    D
    `(lamda)/(T) = 0.693`

  • The distance constant lamda of a radioactive material depends upon the temperature T according to the following relation in which a and b are constants for the material .

    A
    a) `lamda=aT`
    B
    b) `lamda=aT^(-1)`
    C
    c) `lamda=aT^0`
    D
    d)`lamda=aT + bT^(-1)`

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