The activity of a 10.0 g sample of decreases from to in 18.0 h

PHYSICS · Subjective · A Level · Physics · Nuclear physics · Nuclear physics

Problem

The activity of a 10.0 g sample of

^{99\text{m}}\text{Tc}

decreases from

4.0\times10^{5}\,\text{Bq}

5.0\times10^{4}\,\text{Bq}

in 18.0 h. Determine the half-life of

^{99\text{m}}\text{Tc}

, in hours.