An Pipe of Length L That Is Open at Both

Multiple Choice

An pipe of length L that is open at both ends is resonating at its fundamental frequency. Which statement about the sound is correct?

A) The wavelength is 2L and there is a displacement node at the pipe's midpoint.
B) The wavelength is L and there is a displacement antinode at the pipe's midpoint.
C) The wavelength is L and there is a displacement node at the pipe's midpoint.
D) The wavelength is 2L and there is a displacement antinode at the pipe's midpoint.