Chapter 15, Problem 54A

To determine

To Explain:The way through which the slide of a trombone changes the pitch of a sound.

Explanation of Solution

Introduction:

The frequencies of the vibrating air that will set into resonance are determined by the air column’s length.

The amplitude of a vibration is increased due to resonance, by periodicallyexerting a small external force at the same frequency as the natural frequency of the body.

In an instrument, air column’s length determines the frequency of the vibrating air that will set into resonance. On playing of the instrument, the air inside the column vibrates at the equal frequency, or in resonance with the lips.

For a trombone, when the length of the column of vibrating air changes, then the pitch (frequency) of the instrument varies.

Conclusion:

The pitch of sound can be changed by changing the length of the air column.