Which statement is true regarding the waves shown? a) doubling the frequency of the bottom waves by will cause it to match the top waves. b) cutting the frequency of the bottom waves in half will cause it to match the top waves. c) there is no way to match the bottom and top waves to the same frequency. d) decreasing the frequency of the top waves by half will cause it to match the bottom waves.

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.