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What kind of node occurs at the open rend of a resonant tude?

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What kind of node occurs at the open end of a resonant tube?

Oct 22nd, 2017

The answer is An antinode occurs at the open end of a resonant tube.

Why do we have anti-nodes at the open end of a tube? Waves can be reflected, not only at the closed end of a tube, but also at the open end of a tube. Reflection occurs at the open end of a tube as a consequence of a phenomenon called radiation impedance, which occurs when a tube suddenly opens into a much larger space. Movement of air particles is not inhibited as it is at the closed end of the tube and so wave reflection occurs without inversion and anti-nodes are created at the open end.

However At the open end of a closed pipe; however,both nodes and antinodes are possible to form depending on the wavelength of the sound waves as well as the pipe's length. 

http://clas.mq.edu.au/speech/acoustics/frequency/resonance.html


The open end provides the conditions for an antinode, but the actual antinode has been found to occur outside the tube at a distance of about 0.6 r from the end, where r is the tube radius.

Reference 

http://hyperphysics.phy-astr.gsu.edu/hbase/class/phscilab/restube2.html

Sep 24th, 2014

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