An atom of carbon has a radius of 67. pm and the average orbital speed of the electrons in it is about 1.3 x 10 m/s. Calculate the least possible uncertainty in a measurement of the speed of an electron in an atom of carbon. Write your answer as a percentage of the average speed, and round it to 2 significant digits.

Tooth enamel consists mainly of the mineral calcium hydroxyapatite, ca_10(po_4)_6(oh)_2. trace elements in teeth of archaeological specimens provide anthropologist with clues about diet and diseases of ancient people. students at hamline university measured strontium in enamel from extracted wisdom teeth by atomic absorption spectroscopy. solutions with a constant total volume of 10.0 ml contained 0.726 mg of dissolved tooth enamel plus variable concentrations of added sr. added sr find the concentration of sr in the 10 ml sample solution in parts per billion = ng/ml. find the concentration of sr in tooth enamel in parts per million = mu g/g.