Exploring Physics of Exponential Horns

In summary, the volume velocity at the mouth of an exponential horn is greater than the applied volume velocity at the throat, as stated in "Horn Physics" by Martin King. This can be attributed to the fact that volume velocity is equal to velocity times cross sectional area, indicating that the air expands as it passes through the horn, leading to a decrease in air density. This can still hold true even if the velocity is subsonic. As for finding a cheap method to demonstrate this, the website "Brass Acoustics" provided by the University of New South Wales in Australia is a helpful resource on the science of musical instruments.
  • #1
HengHY
5
0
I am trying to understand the physics of an exponential horn. I got most of my references online and according to the Horn Physics by Martin King, the volume velocity at the mouth is greater than the applied volume velocity at the throat (the horn is driven by a speaker/buzzer).
This is what i think
Volume velocity = velocity*cross sectional area
If this is true then the air expands when it passes through the horn (the air density decreases). Can this be true even though the velocity is subsonic?
Any possible cheap method to justify that? I have limited books to read.

Cheers
 
Physics news on Phys.org
  • #2
Hi HengHY! :smile:

A good resource for musical instrument science is the australian site http://www.phys.unsw.edu.au/jw/brassacoustics.html" :wink:
 
Last edited by a moderator:

FAQ: Exploring Physics of Exponential Horns

What is an exponential horn?

An exponential horn is a type of horn-shaped device used to amplify sound waves. It is designed with a gradually expanding cross-sectional area, which causes the sound waves to be compressed and amplified as they travel through the horn.

How does an exponential horn work?

An exponential horn works by using the principles of acoustic impedance and resonance. The gradually expanding shape of the horn causes the sound waves to be compressed and amplified, resulting in a louder and more focused sound.

What are some real-world applications of exponential horns?

Exponential horns are commonly used in speaker systems, musical instruments (such as trumpets and tubas), and even in some musical toys. They can also be found in industrial applications, such as air horns and sirens.

What is the relationship between the length of an exponential horn and the sound it produces?

The length of an exponential horn is directly related to the frequency of the sound it produces. The longer the horn, the lower the frequency of the sound will be. This is due to the fact that longer horns have a larger volume, which allows for lower frequency sound waves to amplify and resonate.

What are the advantages of using an exponential horn over other types of amplification devices?

Exponential horns have several advantages over other types of amplification devices. They are more efficient in converting electrical energy into sound energy, resulting in a louder and clearer sound. They also have a more focused and directional sound, making them ideal for certain applications where precision is important.

Similar threads

Acoustic horns and impedance matching
Replies
2
Views
4K
Why does the outlet pressure in a hair dryer remain constant?
Replies
2
Views
19K
  • Sticky
Other Collection of Free Online Physics Books and Lecture Notes (Part 2)
Replies
27
Views
5K
Bernoulli vs Newton - air flow characteristics
Replies
7
Views
4K
A Modeling the damping of a physical rigid pendulum
Replies
1
Views
994
An odd question regarding Bernoulli's Principle
Replies
5
Views
2K
Do Objects with Different Masses Fall at the Same Rate in Air?
Replies
7
Views
3K
Changing cross-sectional area effect on induced current
Replies
10
Views
4K
I How specifically does an accelerated uniform rod Lorentz contract?
2
Replies
55
Views
4K
Helmholtz resonator/Bernoulli's Principle
Replies
4
Views
9K

Hot Threads

Recent Insights

Back
Top