Activity of a radioactive substance can be represented by various unit. Select correct option
$1\ dps$ = $10^6\ Bq$
$1\ Ci$ = $3.7×10^{10}\ dps$
$1\ Ci$ = $1\ Bq$
$1\ Bq$ = $10^6\ Rd$
The activity of a sample reduces from $A_0$ to ${A_0} / \sqrt{3}$ in one hour. The activity after $3$ hours more will be
In a sample of radioactive material, what percentage of the initial number of active nuclei will decay during one mean life .......... $\%$
The half life of a radioactive sample undergoing $\alpha$ - decay is $1.4 \times 10^{17}$ s. If the number of nuclei in the sample is $2.0 \times 10^{21}$, the activity of the sample is nearly
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
An archaeologist analyses the wood in a prehistoric structure and finds that $C^{14}$ (Half life $= 5700\, years$) to $C^{12}$ is only one-fourth of that found in the cells of buried plants. The age of the wood is about ..........$years$