What must the intensity level of a 100 Hz tone be so that it sounds as loud as a 1000 Hz tone at 65 dB? A 100 Hz tone at loudness 40 phons is played simultaneously with a 1000 Hz tone at intensity 40 dB. What is the intensity in W/m^2 of the combined sound?  Answer all part please it is one question

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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.