Image: Dopplereffectsourcemovingrightatmach1.4

Description: The sound source has now broken through the sound speed barrier, and is traveling at 1.4 times the speed of sound, c (Mach 1.4). Since the source is moving faster than the sound waves it creates, it actually leads the advancing wavefront. The sound source will pass by a stationary observer before the observer actually hears the sound it creates. As a result, an observer in front of the source will detect f=(c+vrc−vs)f0=−2.5f0{\displaystyle f=\left({\frac {c+v_{r}}{c-v_{s}}}\right)f_{0}=-2.5f_{0}\,} and an observer behind the source f=(c−vrc+vs)f0=0.42f0{\displaystyle f=\left({\frac {c-v_{r}}{c+v_{s}}}\right)f_{0}=0.42f_{0}\,}.
Title: Dopplereffectsourcemovingrightatmach1.4
Credit: Own work
Author: Lookang many thanks to Fu-Kwun Hwang and author of Easy Java Simulation = Francisco Esquembre
Usage Terms: Creative Commons Attribution-Share Alike 3.0
License: CC BY-SA 3.0
License Link: http://creativecommons.org/licenses/by-sa/3.0
Attribution Required?: Yes