An ambulance traveling eastbound at 120.0 km/h with sirens blaring at a frequency of 8.00 ✕ 102 Hz passes cars traveling in both the eastbound and westbound directions at 53.0 km/h. (Assume the speed of sound is 343 m/s.) (a) What is the frequency observed by the eastbound drivers as the ambulance approaches from behind? (b) What is the frequency observed by the eastbound drivers after the ambulance passes them? (c) What is the frequency observed by the westbound drivers as the ambulance approaches them?

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Shock Waves

Shock waves are common in continuum mechanics, and their dominance is attributable to the fact that they are stronger (or even less) compressible. Substantial perturbations propagated as sudden dynamic changes of a compressible medium supersonically. Shock waves are all around us in our daily lives. Lightning, earthquakes, volcanic eruptions, and meteorite impact all produce them in nature. Even the earth, which is protected by its magnetic field, generates a shock wave as in solar wind that travels around 20 Earth radiuses. These shock waves might be either constant, linked to the body, or unsteady, i.e., moving around with time. All of the shocks mentioned above can be damaging, so precautions must be taken to reduce their impact.