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The number of atoms of a radioactive sub...

The number of atoms of a radioactive substance at t = 0 is ` 8 xx 10^(4)` . Its half- life periodis 4 years. The number of atoms left undecayed will be ` 1 xx 10 ^(4)` after an interval of

A

9 years

B

12 years

C

16 years

D

None

Text Solution

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The correct Answer is:
B
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Knowledge Check

  • In a radioactive substance at t = 0 , the number of atoms is 8 xx 10^4 . Its half-life period is 3 years. The number of atoms 1 xx 10^4 will remain after interval.

    A
    9 years
    B
    8 years
    C
    6 years
    D
    24 years

  • A radioactive substance has 10^8 nuclei. Its half life is 30 s . The number of nuclei left after 15 s is nearly

    A
    `2 xx 10^5`
    B
    `3 xx 10^6`
    C
    `7xx 10^7`
    D
    `5 xx 10^8`

  • The decay constant of a radioactive element is 1.05xx10^(-4) / year. What is its half life ?

    A
    5000 years
    B
    6000 years
    C
    6600 years
    D
    7200 years

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