You start with 400 parent atoms of a particular radioactive type, which decays to give stable offspring. You wait just long enough for three

Question

You start with 400 parent atoms of a particular radioactive type, which decays to give stable offspring. You wait just long enough for three half lives to pass. You should expect to have how many parent atoms remaining (on average):

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Parker 3 months 2022-02-21T18:03:29+00:00 2 Answers 0 views 0

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    0
    2022-02-21T18:05:05+00:00

    Answer:

    The options:

    A. 400.

    B. 200.

    C. 100.

    D. 50.

    E. 25.

    The CORRECT ANSWER IS D.

    D. 50.

    Explanation:

    A half-life is the time needed for a certain amount of substance to decrease to half of its actual value. The term is mostly employed in nuclear physics to show how swiftly unstable atoms go through a process, or indicate long stable atoms passing through the phase of a radioactive decay.

    It’s necessary to note that after:

    One half-life,

    It reduces from 400 parents to 200;

    At the end of the secod half-life,

    It reduces from 200 parents to 100;

    At the close of the third half-life,

    It decreases further from 100 parents to 50.

    Certain experiments of radioactive decay employs more atoms, to prevent statistical fluctuations, of which our case studies pinpoints to “on average”, it uses 400 instead of 400,000,000,000,000 to give us less difficulty.

    0
    2022-02-21T18:05:21+00:00

    Answer:

    50

    Explanation:

    If you start with 400 atoms

    After one half-life: 200 atoms

    After a second half-time: 100 atoms

    And after a third half-time: 50 atoms

    Note that this is an example of calculation since typical studies of radioactive decay use many more atoms, to avoid statistical fluctuations.

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45:5+15-5:5+20+17*12-15 = ? ( )