So my friend in a general physics class did an experiment testing the speed of sound by snapping their fingers and having it bounce through a tube open and another that is closed. They measured a faster speed in the open tube and I am at a loss why. Did they do the measurements wrong possibly or is there an explanation for faster speed of sound in an open tube? They measured the speed of sound in the open tube about 10 m/s faster. I tried to do a search on the net but found nothing besides it changing the effective length of the wave and such, but not sure that effects the speed. Thanks.