Chapter 4: Q63E (page 916)
Determining Diet. One method for determining the amount of corn in early Native American diets is the stable isotope ratio analysis (SIRA) technique. As corn photosynthesizes, it concentrates the isotope carbon-13, whereas most other plants concentrate carbon-12. Overreliance on corn consumption can then be correlated with certain diseases, because corn lacks the essential amino acid lysine. Archaeologists use a mass spectrometer to separate the
Short Answer
(a) The strength of magnetic field is required is
(b) The diameter of the 13C semicircle is
(c) The separation of the 12C and 13C ions at the detector at the end of the semicircle is