1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Resonance in a tube

  1. Nov 25, 2012 #1
    Why do we assume that an antinode is present at open end of a tube?
    Can a node be possible at open end?
    Thank you in advanced.
  2. jcsd
  3. Nov 25, 2012 #2


    User Avatar
    Science Advisor
    Homework Helper

    hi amk_dbz! :smile:

    how can there be a node at an open end ?

    there's a node at a closed end because the air can't move there (in the pipe, air only moves longitudinally, of course)

    there can be nodes in the middle of the pipe, but only because of interference from reflection from both ends

    at the open end, there's nothing on the "outside" side to reflect from, so no interference and no node! :wink:

    (and if there's a standing wave, the end must be either a node or an anti-node, so in this case, it's an anti-node)

    btw, the anti-node is actually just outside the open end … you need to apply an "end correction"

    for details, see my favourite sound site, http://www.phys.unsw.edu.au/jw/flutes.v.clarinets.html#time
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook