Physics 2018 JAMB Past Questions - Question 21: The pitch of an acoustic device can be increased by

Correct Answer

C

Explanation

The pitch of an acoustic device can be increased by several methods. Here are a few ways to achieve this:

1. Tension adjustment: For stringed instruments like guitars or violins, increasing the tension of the strings can raise the pitch. This can be done by tightening the tuning pegs or adjusting the string tension using other mechanisms.

2. Length adjustment: For instruments with strings or tubes, such as guitars, flutes, or clarinets, shortening the length of the vibrating element can increase the pitch. This can be done by pressing the strings against the frets on a guitar or covering different finger holes on wind instruments.

3. Air pressure adjustment: In wind instruments like trumpets or saxophones, increasing the air pressure blown into the instrument can raise the pitch. By blowing harder or adjusting the embouchure (mouth position), the player can achieve higher pitches.

4. Instrument modification: Some acoustic devices, such as pianos or xylophones, have mechanisms that allow for pitch adjustment. For example, on a piano, the pitch can be increased by tightening the strings using the tuning pins.

It's important to note that these methods may vary depending on the specific acoustic device you are referring to.