The graph between number of decayed atoms $N'$ of a radioactive element and time $t$ is
(c) Number of atom decayed $N' = {N_0}(1 – {e^{ – \lambda t}})$
$N'$will increase with time $(t)$ exponentially.
The initial activity of a certain radioactive isotope was measured as $16000\ counts\ min^{-1}$. Given that the only activity measured was due to this isotope and that its activity after $12\, h$ was $2000\ counts\ min^{-1}$, its half-life, in hours, is nearest to
Decay constant of radium is $\lambda $. By a suitable process its compound radium bromide is obtained. The decay constant of radium bromide will be
Number of nuclei of a radioactive substance at time $t = 0$ are $1000$ and $900$ at time $t = 2$ $s$. Then number of nuclei at time $t = 4$ $s$ will be
Assertion : ${}^{90}Sr$ from the radioactive fall out from a nuclear bomb ends up in the bones of human beings through the milk consumed by them. It causes impairment of the production of red blood cells.
Reason : The energetic $\beta – $ particles emitted in the decay of ${}^{90}Sr$ damage the bone marrow
The half-life period of radium is $1600 $ years. Its average life time will be…….years
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