Where to place vent holes for third and fourth modes in an open pipe

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Homework Statement


Where would you locate a small vent hole to encourage the third mode of an open pipe? The fourth mode?

Homework Equations



Hint: Where is a node of the desired mode?

The Attempt at a Solution



Does this mean 1/3 of the way down for mode 3 and 1/4 of the way down for mode 4?
 
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