The decay constant of the end product of a radioactive series is
zero
infinite
finite (non zero)
depends on the end product
The count rate of $10\,g$ of radioactive material was measured at different times and this has been shown in the figure. The half life of material and the total counts (approximately) in the first half life period, respectively are
In the radioactive decay of an element it is found that the count rate reduces from 1024 to $128$ in $3$ minutes. Its half life will be ...... minute
The rate of radioactive disintegration at an instant for a radioactive sample of half life $2.2 \times 10^9 \;s$ is $10^{10}\; s ^{-1}$. The number of radioactive atoms in that sample at that instant is,
$99 \%$ of a radioactive element will decay between
A radioactive substance has an average life of $5$ hours. In a time of $5$ hours