This depends on whether the pipe is closed or open ended.
The fundamental frequency of a pipe is the simplest, smallest portion of a wave that can fit into a pipe. At the open end of a pipe, there is always an antinode – an area with maximum air movement.
If it is an open ended pipe, there is an antinode at each end, meaning that the length of the pipe is equal to 1/2 ##lambda##. Manipulating the formula ##v = f lambda## to solve for the fundamental frequency leaves us with ##f = v / (2L)## in an open ended pipe.
If it is a closed ended pipe, there is an antinode at the open end and a node at the closed end – causing the sound to reflect – meaning that the length of the pipe is equal to 1/4 ##lambda##. Again, if we manipulate the formula ##v = f lambda## to solve for the fundamental frequency, this leaves us with ##f = v / (4L)## in a closed ended pipe.
The website http://www.studyphysics.ca/newnotes/20/unit03_mechanicalwaves/chp141516_waves/lesson51.htm gives further explanation for you.
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