An open organ pipe with a length of 50.0 cm is oscillating in its second-overtone or third-harmonic mode. Assume the air to be at room temperature and the pipe to be at rest in still air. A person moves toward this pipe at and, at the same time, away from a highly reflective wall.
(a) Will the observer hear beats: (1) yes, (2) no, or (3) can’t tell from the data given?
(b) Calculate the frequency of sound emitted.
(c) Calculate the beat frequency the observer would hear.