Question

When the string on a guitar is tightened, its pitch

• A. Increases
• B. Decreases
• C. Remains same
• D. May increase or decrease

Answer 1

The correct option is A Increases

The string of a guitar is like a stretched string fixed at both ends, and the frequency of a stretched string is directly proportional to the tension in the string,

$f\propto \sqrt{T}$ ,

When the string is tightened, tension $T$ in the string increases, hence frequency $f$ also increases. As the pitch of a sound depends upon its frequency, therefore, its pitch also increases.