The decay constant $\lambda $ of the radioactive sample is the probability of decay of an atom in unit time, then
The decay constant $\lambda $ of the radioactive sample is the probability of decay of an atom in unit time, then
- 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
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After $280$ days, the activity of a radioactive sample is $6000\, dps$. The activity reduces to $3000\, dps$ after another $140\, days$. The initial activity of the sample in dps is
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- [IIT 2004]