Posted by Mark in Ohio on August 18, 2000 at 22:42:04:
In Reply to: Re: Re: Re: Kleenex and Spit posted by Joe Baker on August 18, 2000 at 12:50:37:
Joe,
Yes, a reflector has to be significantly larger than the wavelengths intended to be reflected. The rough rule of thumb is 4 times the wavelength you hope to re-direct. Sound behaves like a fluid, and can "go around" objects, hence the 4x rule.
A low Bb (third space below staff) on the tuba is about 60 Hz. The speed of sound is roughly 1130 feet per second. Wavelength = speed of sound / frequency, so 1130 feet/60 Hz equals a wavelength of 18.833 feet.
A reflector that can control low Bb would therefore have to be about 75 feet in diameter. Bigger than MY basement, buddy.
~-0^0-~ Mark in Ohio.
PS: don't take up the clarinet. As Rick has proven, tuba carries the day better.