Why, when one opens 1 car window, does that noise occur?
My knowledge in this area is really out-of-dated and stopped somewhere like ten years ago. So I would like to extend and update it.
I'm driving a car. I have opposite window fully open. I'm speeding to a speed around or slightly over 100 km/h. The air that comes through open window becomes "very loud" with a strange, pitching sound, that can be even interpreted as some kind of explosion.
What is this? Why this happens only at certain (rather high) speeds and only with window fully or nearly fully open? Can it be dangerous (distraction to driver)?
I barely remember that this could have something with sound (air?) pressure or the sound wave diffraction. But, since I had nearly absolutely nothing to do with physics for the last ten years, my information might be very wrong.