- #1
amk_dbz
- 42
- 0
Why do we assume that an antinode is present at open end of a tube?
Can a node be possible at open end?
Thank you in advanced.
Can a node be possible at open end?
Thank you in advanced.
In summary, the presence of an antinode at the open end of a tube is assumed because there is no interference or reflection from the outside to create a node. However, in the case of a standing wave, the end must be either a node or an antinode, with the latter being the case for an open end. This can be further explained by applying an "end correction" and can be found on the website mentioned.
- #2
tiny-tim
Science Advisor
Homework Helper
- 25,839
- 258
hi amk_dbz! 
how can there be a node at an open end ?
there's a node at a closed end because the air can't move there (in the pipe, air only moves longitudinally, of course)
there can be nodes in the middle of the pipe, but only because of interference from reflection from both ends
at the open end, there's nothing on the "outside" side to reflect from, so no interference and no node!
(and if there's a standing wave, the end must be either a node or an anti-node, so in this case, it's an anti-node)
btw, the anti-node is actually just outside the open end … you need to apply an "end correction"
for details, see my favourite sound site, http://www.phys.unsw.edu.au/jw/flutes.v.clarinets.html#time
how can there be a node at an open end ?
there's a node at a closed end because the air can't move there (in the pipe, air only moves longitudinally, of course)
there can be nodes in the middle of the pipe, but only because of interference from reflection from both ends
at the open end, there's nothing on the "outside" side to reflect from, so no interference and no node!
(and if there's a standing wave, the end must be either a node or an anti-node, so in this case, it's an anti-node)
btw, the anti-node is actually just outside the open end … you need to apply an "end correction"
for details, see my favourite sound site, http://www.phys.unsw.edu.au/jw/flutes.v.clarinets.html#time
1. What is the open end of tube resonance phenomenon?
Open end of tube resonance is a phenomenon in which a standing wave is created in an open-ended tube, causing the air molecules inside the tube to vibrate at specific frequencies. This results in the production of sound, and the specific frequencies at which resonance occurs are known as the natural frequencies of the tube.
2. How does the length of the tube affect the resonance frequency?
The length of the tube is directly proportional to the resonance frequency. This means that as the length of the tube increases, the resonance frequency also increases. This is because a longer tube allows for more wavelengths to fit inside, resulting in a higher frequency.
3. What is the difference between antinodes and nodes in open end of tube resonance?
Antinodes are points in the standing wave where the amplitude of vibration is at its maximum, while nodes are points where the amplitude is at its minimum or zero. In an open-ended tube, there will always be an antinode at the open end, while nodes will be present at specific intervals along the length of the tube.
4. Can different types of tubes produce different resonance frequencies?
Yes, the type of tube can affect the resonance frequencies. For example, a tube with a larger diameter will have lower resonance frequencies compared to a tube with a smaller diameter. This is because the larger diameter allows for more air molecules to vibrate, resulting in a lower frequency.
5. How is open end of tube resonance used in musical instruments?
Open end of tube resonance is used in various musical instruments, such as flutes and clarinets. By changing the length of the tube (by opening or closing holes), different natural frequencies can be produced, allowing for a range of notes to be played. The placement of the holes also determines the locations of nodes and antinodes, affecting the quality of sound produced.
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