Question

A tuning fork with a frequency of 440 Hz is held above a resonance tube that is partially filled with water. Assuming that the speed of sound in air is 342 m/s, for what three smallest heights of the air column will resonance occur? Where will the nodes and anti-nodes occur? (Hint: For resonance to occur, the frequency of the tuning fork must match that of the tube.)

I understand finding the wavelength and finding the height that resonance will occur in the air column but I can't figure out how to find where the nodes and anti nodes occur. Can somebody explain please.
bobpursley
Look at the figures with the closed tube.

http://media.paisley.ac.uk/~davison/labpage/tube/tube.html

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