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CMC Medical CMC-Medical Ludhiana Solved Paper-2014

  • question_answer
    The decay constant A. of a radioactive sample is the probability of decay of an atom in unit time. Then,

    A)  \[\lambda \] decreases as the atom becomes older

    B)  \[\lambda \] is independent of the age of atoms

    C)  \[\lambda \] increases as the age of atom

    D)  behaviour of \[\lambda \] with time depends on the nature of the activity

    Correct Answer: B

    Solution :

                    Decay constant of radioactive sample is reciprocal of the time after which the number of atoms of a radioactive substance decreases to 36.8% of their number of pressure initially and it does not depend on the age of the atoms.


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