(a) The fossilized leaf has 70% of its normal amount carbon 14. how old is fossil?
(b) The thermometer reading 72oF is placed in the refrigerator where is constant 38oF.
(i) if thermometer reads 60oF after 2 minutes, what will it read after seven minutes?
(ii) How long will it take before thermometer reads 39oF?
(iii) Find time required to elapse before thermometer reads 45oF?