A sample of a radioisotope has an activity of 2.5mCi at 10:00 a.m. The half-life of the nuclide is 12h.
(a) Convert the given activity to becquerel.
(b) Calculate its activity at 4:00 p.m. on the same day.
(c) Express the answer obtained in part (b) both in Bq and in mCi, rounding each to two significant figures.