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This question already has an answer here:

Why does a wave reflect on the edge of an open tube? There is nothing solid to make the wave bounce.

Then why is it reflected?

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marked as duplicate by Qmechanic Sep 15 at 22:51

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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The boundary condition is that the sound pressure is zero there.

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  • $\begingroup$ Is pressure zero? what do you mean... $\endgroup$ – molo32 Sep 15 at 18:48
  • $\begingroup$ The pressure there is given by the ambient pressure (for example 1 atm). This gives that the sound pressure is (almost) zero there, much smaller than inside the tube. So for the sound pressure, this is a fixed end. $\endgroup$ – Pieter Sep 15 at 18:57
  • $\begingroup$ @Pieter The pressure variation about atmospheric pressure is zero. $\endgroup$ – Farcher Sep 15 at 19:21

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