My point exactly. I agree with you. Low frequency can transfer itself through solid materials by vibrating them, while high frequencies are much more attenuated. 0000000000000000000000000000000 BTW How does light pass through transparent glass ? It does not, it is re-radiated. from: http://www.madsci.org/posts/archives/2000-10/972223736.Ph.r.html When photons of electromagnetic radiation pass through a substance the energy can be transmitted, it can be scattered or the energy can be absorbed as heat. As the photons encounter atoms, or molecules composed of bonded atoms, they temporarily raise the electrons of these particles to a higher energy state (quantum level). Depending on the physical properties of these atoms or molecules, and their physical spacing, the electrons can reradiate an identical energy photon (the same wavelength) in the same direction as the incident photon was traveling. However, in this process there is a slight delay in the transmission by each atom or molecule. This delay appears to slow down the speed of light passing through the material and we call this the index of refraction of the material. Cedric > > On Jun 27, 2007, at 6:27 PM, Rich wrote: > > Light is a pretty short wavelength and it cannot pass through walls > but > x-rays can, THz waves can but UHF, VHF HF and LF cannot. Audio > cannot pass > through walls. Audio waves are mechanical and can cause the wall > to vibrate > at the same frequencies and thereby vibrate the air molecules on > the other > side, which re-creates the sound. It may seem as though the sound > goes > through the wall but it does not. The mechanical force of the > vibrating air > molecules cause the motion of the wall. > > ----- Original Message ----- > From: "Cedric Chang" > To: "Microcontroller discussion list - Public." > Sent: Wednesday, June 27, 2007 4:10 PM > Subject: Re: [OT] Why do I only hear the bass drum? > > >> Okay, I am think I am the only substantially correct answer so far. >> It has to do with wavelength. >> Shorter wavelengths have trouble bending around objects and have >> more difficulty passing through objects ( like walls ). >> Longer wavelengths not only bend around larger objects and >> pass through walls more easily ; they are more likely to cause >> objects to resonate which creates more ugly sound. >> >> Imagine a car next to you with the bass turned up. The car seems to >> actually move up and down with the bass. No matter how high an >> amplitude the higher frequencies attain, they don't move the car >> although they may shatter a goblet inside. >> >> Cedric >> >> On Jun 27, 2007, at 12:31 PM, Lindy Mayfield wrote: >> >> It doesn't happen often, but now and again a neighbor some houses >> down has a party or for some reason turns up the music really loud. >> And it's the worse possible music to pick because it has a very loud >> bass drum on every beat. Probably techno. So all I hear is boom- >> boom-boom-boom,boom-boom-boom-boom,etc. >> >> It's worse than Chinese water torture. >> >> Anyway I was trying to understand why I only hear the bass. Is it >> because of the length of the wave that it travels farther or through >> more things than the higher notes? I was trying to make a comparison >> for example between AM radio waves, FM, and cell phones in the >> gigahertz range. Or is it because there is so much more energy in >> the bass? But then I though how far away one can hear a mosquito >> with a high pitch in a room or how far a piccolo or fife will carry. >> >> Does anyone have a theory or answer as to why the bass carries so >> far? At least thinking about the physics keeps me from going >> postal. (-: >> >> Lindy >> >> -- >> http://www.piclist.com PIC/SX FAQ & list archive >> View/change your membership options at >> http://mailman.mit.edu/mailman/listinfo/piclist >> >> -- >> http://www.piclist.com PIC/SX FAQ & list archive >> View/change your membership options at >> http://mailman.mit.edu/mailman/listinfo/piclist > > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist