I am looking for anexplanation of this phenomenon:
I was riding my bike, (not driving it, was sitting on the back seat) with the helmet on. While the glass of the helmet was intact, I could hear the sound of air striking my helmet's outer surface, but when I just opened the glass of the helmet,(just opening implies opening it by a very small measure, like few degrees), all the noise of the air was gone, and then I closed the glass the noise came back.
A Few Details
- I was sitting on the back seat, so the wind was striking my helmet on its lateral sides
- My helmet is a very simple one--it doesn't bear the golfball-like craters, to counter friction
- The noise was coming from all the sides of the helmet, even the back,(or it was just the sides). It was like a 3-d experience,