The curve between the activity $A$ of a radioactive sample and the number of active atoms $N$ is
(b) $\left| {\frac{{dN}}{{dt}}} \right| = \lambda N$
==> $\left| {\frac{{dN}}{{dt}}} \right| \propto N$
Write a formula showing the relation between half life and average life of a radioactive substance.
There are $10^{10}$ radioactive nuclei in a given radioactive element, Its half-life time is $1\, minute.$ How many nuclei will remain after $30\, seconds?$
$(\sqrt{2}=1.414)$
$99 \%$ of a radioactive element will decay between
A element used for radioactive carbon dating for more than $5600$ years is
Which is the correct expression for half-life
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