College Physics with MasteringPhysics 7th Edition by Jerry Wilson,Anthony Buffa,Bo Lou

Exercise 66

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 tempera hue and the pipe to be at rest in still air. A person moves toward this pipe at 2.00 m/s 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. [ Hint : There are two frequencies, one directly from the pipe and one from the wall.]