Physics for best answer?

Posted on 2017-02-14 06:09:00 in Physics by JIMM

I have never felt as if a problem should be easier before, but somehow something went horribly wrong in this unit that has left me utterly confused on a simple topic. 

The length of a hollow pipe is 624 cm. The air column in the pipe is vibrating and has seven nodes. Find the frequency of the sound wave in the pipe. The speed of sound in air is 343 m/s. Answer in Hz. 

I know that v= wavelength * frequency, but I oddly can't seem to comprehend how many waves there are in this one pipe, which would give me wavelength. How can you fidn the wavelength with only knowing 7 nodes, I know that the distance between two nodes=wavelength/2

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