A solution contains 1 milli curie of L-phenyl alanine C14 (uniformly labelled) in 2.0 mL solution. The activity of labelled sample is given as 150 milli curie/milli mole. Calculate:
(a) the concentration of sample in the solution in mole/litre.
(b) the activity of the solution in terms of counting per minute/mL at a counting efficiency of 80%.