A radioactive substance has a half-life of

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

Problem

64.8\ \text{h}

. A sample containing this isotope has an initial activity at

t = 0

40\ \mu\text{Ci}

. Calculate the number of nuclei that decay in the time interval between

t_1 = 10.0\ \text{h}

and

t_2 = 12.0\ \text{h}