(III) A police car sounding a siren with a frequency of 1580 Hz is traveling at 1280 km/h (a) What frequencies does an observer standing next to the road hear as the car approaches and as it recedes? (b) What frequencies areheard in a car traveling at 90.0 km/h in the opposite direction before and after passing the police car? (c) The police car passes a car traveling in the same direction at 80.0 km/h What two frequencies are heard in this car?

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Q: Show that the speed of sound in 20.0°C air is 343 m/s, as claimed in the text.

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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.