How Does a Bugler Control Frequency with Lip and Air Pressure Adjustments?

It does not specify that these are the only tones produced by the instrument, just that they are among the tones produced. With that in mind, the effective length of the bugle is 0.786 m, as calculated using the equation L = v/f where v is the speed of sound in air and f is the lowest tone produced (440 Hz). This is because the bugle is able to produce a range of tones without changing the length of the air column, meaning that the effective length must remain constant.
  • #1
halo168
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Homework Statement


By adjustin her lips correctly and blowing with the proper pressure, a bugler can cause her instrument to produce a sequence of tones, amog which are the following: 440, 660, 880, 1100, . . . Hz --- all without changing the length of the air column. (b) What is the ffective length of this bugle? (use 346 m/s for the speed of sound in air).

Homework Equations


2L = v/f

The Attempt at a Solution


I got 0.393 m with the equation 2L = v/f where v is the speed of sound through air and f is 440 m/s (effective frequency). The answer was rather 0.786 m whifch is basically L = v/f (without the 2L). Isn't lambda = 2L?
If so, where did it go?
 
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  • #2
halo168 said:
a sequence of tones, among which are
Take careful note of that wording.
 

1. What are standing waves in a bugle?

Standing waves in a bugle are a result of the reflection and interference of sound waves within the instrument. They create a unique pattern of nodes and antinodes, or points of maximum and minimum amplitude, which ultimately determine the pitch of the bugle's sound.

2. How do standing waves produce sound in a bugle?

As air is blown into the bugle, it travels through the mouthpiece and into the narrow cylindrical tubing. The sound waves produced bounce off the closed end of the bugle and reflect back towards the mouthpiece, creating standing waves. The vibration of these standing waves is what produces sound.

3. Why do standing waves have different pitches in a bugle?

The length of the bugle's tubing determines the wavelengths of the standing waves, and therefore, the pitch of the sound produced. Longer tubing produces longer wavelengths and lower pitches, while shorter tubing produces shorter wavelengths and higher pitches.

4. Can standing waves be altered in a bugle?

Yes, standing waves can be altered in a bugle by adjusting the length of the tubing. This can be done by using valves or slides to change the total length of the bugle, thus changing the wavelengths and ultimately the pitch of the standing waves.

5. How do standing waves affect the sound quality of a bugle?

The standing waves in a bugle create a unique sound quality that is characteristic of the instrument. They also allow for the bugle to produce a range of different pitches, making it a versatile and important instrument in many musical genres.

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