$1 \,mg$ gold undergoes decay with $2.7$ days half-life period, amount left after $8.1$ days is ......... $mg$
$0.91$
$0.25$
$0.5$
$0.125$
The half life of radium is $1620$ years and its atomic weight is $226\, k\,gm$ per kilomol. The number of atoms that will decay from its $1\, gm$ sample per second will be
(Avogadro's number $N = 6.02 \times {10^{26}}$atom/kilomol)
Write down the definition and formula of half life of radioactive substance.
Which sample, $A$ or $B$ shown in figure has shorter mean-life?
A radioactive decay chain starts from $_{93}N{p^{237}}$ and produces $_{90}T{h^{229}}$ by successive emissions. The emitted particles can be
Give the equation form of exponential law.