A plate with dimensions L × L vibrates according to the harmonic law with
frequency ω≫ c, where c is the speed of sound in air. Estimate the force
L
acting on the plate from the air side at the moment when the velocity of the
plate is v. The density of air is ρ. How does the air move if ω≪ c? Why is the
L
emission of sound weak in this case?
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