tuanquang269 wrote:
Guitar strings often go "dead"--become less responsive and bright in tone--after a few weeks of intense use. A researcher whose son is a classical guitarist hypothesized that dirt and oil, rather than changes in the material properties of the string, were responsible.
Which of the following investigations is most likely to yield significant information that would help to evaluate the researcher's hypothesis?
(A) Determining if a metal alloy is used to make the strings used by classical
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