Rubens' tube
Rubens' tube is a tube that is filled with inflammable gases and has a speaker attached to its end. The tube also has several holes in it. When the gas is lit and the speaker is set to an arbitrary frequency, the tube forms a waveform.
What is the pressure at the nodes?
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1 solution
The pressure at the nodes will be high.From Bernoulli principle we know that air travels from high to low pressure hence there is a surplus of inflammable air in low pressure region which we see as anti-node.