The half-life of a radioactive nuclide is $100 \,hours.$ The fraction of original activity that will remain after $150\, hours$ would be :
$\frac{1}{2}$
$\frac{1}{2 \sqrt{2}}$
$\frac{2}{3}$
$\frac{2}{3 \sqrt{2}}$
Alpha rays emitted from a radioactive substance are
A radioactive material decays by simultaneous emissions of two particles with half lives of $1400\, years$ and $700\, years$ respectively. What will be the time after which one third of the material remains? (Take In $3=1.1$ ) (In $years$)
$x$ fraction of a radioactive sample decay in $t$ time. How much fraction will decay in $2t$ time
A radioactive material has a half life of $10$ days. What fraction of the material would remain after $30$ days
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