Final answer:
Tightening a guitar string increases the tension and leads to a higher wave speed, resulting in a higher frequency sound produced.
Explanation:
When a guitar string is tightened, the tension in the string increases. This increased tension leads to a higher wave speed along the string due to the relationship between tension and wave speed. Consequently, the frequency of the sound produced by the guitar also increases because frequency is directly proportional to wave speed.
Learn more about relationship between tension and wave speed in guitar strings here:
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