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This question already has an answer here:

Inside and outside of an open organ pipe usually medium used to be same (if i am not wrong) i.e Air, so in order to get standing wave reflection of wave is needed ( opp.in direction nd of same frequency). but how wave can get reflected at an open end without even changing medium? none of my teachers able to answer it in a satisfied way. Any help will be appericiated.

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marked as duplicate by Qmechanic Feb 3 '18 at 18:49

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    $\begingroup$ Does it help to look at a string with different terminations: phet.colorado.edu/en/simulation/wave-on-a-string ? $\endgroup$ – Pieter Feb 3 '18 at 17:44
  • $\begingroup$ The general rule is that any kind of discontinuity in the media may create reflection. The wave solutions on one side of the discontinuity differs from the other side and waveform continuity at this point may enforce a reflecting wave. $\endgroup$ – npojo Feb 3 '18 at 18:10