Final answer:
A tuning peg slipping on a violin reduces the tension in the string which results in the production of a lower pitch. This change can disrupt the harmony of the instrument and needs to be corrected for proper sound quality.
Step-by-step explanation:
When a tuning peg on a violin slips, reducing the tension in one of the strings, the string's sound is affected. This change in tension slows the speed of waves in the string, which results in a lower frequency of the sound that the string produces. Since the frequency of a sound wave determines its pitch, the pitch of the string will decrease, making the sound lower than intended.
Loudness, pitch, and timbre are characteristics that define the quality of a sound produced by a musical instrument. Timbre, also known as tone quality, is distinctive to each instrument and can describe the sound as warm, cold, pure, or rich for example. However, when a string's tension is changed unintentionally, it primarily affects the pitch, not the timbre.
Piano tuners and other musicians often adjust the tension of strings to change the pitch and create a harmonious sound. When a peg slips on a violin, the string may produce a pitch that does not harmonize with the other strings or the intended note, and thus needs to be corrected to restore the correct tension and pitch.