3. One problem the researchers faced was an uncertainty about whether the signals observed in certain mass spectrometry data were, in fact, due to lead isotopes. Explain why this was a problem. In other words, why wasn't information about the mass of the isotopes sufficient for identifying the isotopes? Provide an example to explain your answer.
4. How did the researchers address the problem described in question 3? Do you believe that their method was adequate? Justify your response.
5. Analyze the graph in Figure 4 of the article. Describe the vertical and horizontal axes, and explain how the isotopes are identified by the graph and what the heights of the curves mean.
6. Figure 11 in the article shows a way that researchers used data they obtained from mass spectrometry. Summarize the information about lead isotopes contained in each graph. Explain what conclusions the researchers could draw from these graphs.
The questions are for the article found at the bottom of this website dspace .mit.edu /handle/ 1721.1/ 65562
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