The order of a radioactive disintegration reaction is:

The average life period of a radioactive element is the reciprocal of its

During a nuclear explosion,one of the products is $^{90}Sr$ with a half-life of $28.1 \ years$. If $1 \ \mu g$ of $^{90}Sr$ was absorbed in the bones of a newly born baby instead of calcium,how much of it will remain after $10 \ years$ and $60 \ years$ if it is not lost metabolically?

The Carbon-$14$ dating method is based on the fact that:

$_{11}Na^{24}$ has a half-life of $15 \ h$. On heating,its half-life will:

$A$ wooden artifact and a freshly cut tree have carbon activity of $7.6$ and $15.2 \ min^{-1} g^{-1}$ respectively. Given the half-life $(t_{1/2})$ of carbon is $5760$ years,the age of the artifact is: