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 + v r c − v s ) f 0 = − 2.5 f 0 {\displaystyle f=\left({\frac {c+v_{r}}{c-v_{s}}}\right)f_{0}=-2.5f_{0}\,}and an observer behind the source
f = ( c − v r c + v s ) f 0 = 0.42 f 0 {\displaystyle f=\left({\frac {c-v_{r}}{c+v_{s}}}\right)f_{0}=0.42f_{0}\,}.
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