question_answer

The decay constant \[\lambda \] of the radioactive sample is the probability of decay of an atom in unit time, then [CBSE PMT 1990]

A)            \[\lambda \] decreases as atoms become older

B)            \[\lambda \] increases as the age of atoms increases

C)            \[\lambda \] is independent of the age

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