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The only limit is in trying to get a mechanical device to vibrate at the very high frequencies needed to generate short wavelength sound waves. Specialized applications use sound waves in the several MHz region. There is no hard limit.is there a max/ min limit on acoustic wavelengths(Imean besides mammal audible ranges)? and what happens when we try to cross that acoustic limit?
myabe my question is what is the max freq that won't get dampened out by the air?
You can generate either an acoustic wave or an EM wave at 40KHz (the NIST station from Boulder broadcasts a 60KHz EM signal that "atomic" wall clocks use for synchronization). The type of wave you generate just depends upon the transducer. If you feed the 40kHz electrical signal into an appropriate antenna then you will generate and radiate a 40kHz EM wave in space (no air required). If you feed the 40kHz electrical signal into an appropriate speaker, then you will generate and radiate an acoustic wave in air (air required).YEA I am confused! and i understand the difference ok, but there is something i am getting lost,
let me start: i gots my singen, so i wire it to a speaker, turn up the f and eventually go above audible, but it is still sound(airpressure)? eventually i go up out of tweeter range, but then what about these transducers, they are acoustic too?, do we ever use RF in 40khz range?