At the open end of a pipe of length $l$ that is closed at the opposite end, a loudspeaker producing sound at frequency $f$ is positioned. A standing wave forms inside the pipe. A set of pipes is then arranged using either one loudspeaker or two loudspeakers of frequency $f$. The paired loudspeakers oscillate in phase with one another. In which pipe is a standing wave present?
Physics 9702 · AS & A Level · Stationary waves