The nuclide is unstable and has a decay constant of .

PHYSICS · Multi-part · A Level · Physics · Nuclear physics · Nuclear physics

Problem

The nuclide

{}_{11}^{24}\mathrm{Na}

is unstable and has a decay constant of

1.28\times10^{-5}\ \mathrm{s}^{-1}

. (a) Calculate the half-life of

{}_{11}^{24}\mathrm{Na}

. (b) As a fraction of its initial activity, what would the activity of a sample of

{}_{11}^{24}\mathrm{Na}

be after (i)

15\ \mathrm{h}

and (ii)

30\ \mathrm{h}