The formation of standing wave is accompanied by the generation of wave node and wave abdomen. Different from the transverse standing wave, the longitudinal standing wave also has the thinning part and the dense part. Previous demonstrators of longitudinal standing waves were able to demonstrate these phenomena at a slightly higher frequency (~30Hz), which made it impossible to see how the phenomena changed in density. Except with the help of a strobe or high-speed photography, it would have been a mistake to assume that the wave nodes were and wave abdomens always in the thinning part and the dense part respectively. In this paper, a new demonstrator of the longitudinal standing wave is presented, which can clearly see the periodic density change at the nodes of longitudinal standing wave, the opposite density state at the adjacent node, and the maximum amplitude at wave abdomen with a relatively low frequency (~4Hz).

Xiangming Kong

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