Re: Jim Carr: Two Years Ago Today: As Stupid Then As He Is Now
- From: Tim <tschnautz@xxxxxxxxx>
- Date: Tue, 15 Jan 2008 19:35:00 -0800 (PST)
On Jan 15, 9:33 pm, Tim <tschna...@xxxxxxxxx> wrote:
On Jan 15, 8:13 pm, Monkey Pi <Monke...@xxxxxxxxxxxxxxxxxxxxxx> wrote:
> "It is called "length" because it truly is a length. Amplitude is
a length but has other units, for example with sound, amplitude has
units of pressure. With light, radio waves or other electromagnetic
radiation, the amplitude is electric or magnetic field. Consider the
wavelength of your VHF which is roughly about the length of your 8'
antenna. The wavelength of the microwaves in your microwave oven is
roughly 3 cm (just over an inch). The wavelength of your cell phone
waves is somewhat longer than those in a microwave, about 3X.
Infrared light has a a wavelength as small as .5 micron or about .
00002". Visible light has length between .5 micron (red) and .3
micron (violet). Vacuum Ultraviolet goes from there down to about
angstroms (1 angstrom =1 X10-10 m), soft x-rays from there down to
roughly 6 angstroms and the x-rays your dentist uses down to about .6
angstroms. Gamma rays can be very short.
At the other end of the spectrum, Extremely Low Frequency waves have
lengths comparable to the diameter of the earth. Remember the old AM
radio towers, they were about the length of the AM radio waves. Your
AM radio had a long antenna cuz the AM waves were long whereas the FM
waves are much shorter hence the smaller FM antenna.
I am sure this is MUCH more than you wanted to know but AT LAST, I
to expound on something I know something about (I make x-ray mirrors
for waves that have lengths of anywhere from 120 angstroms to 1.2
So we could actually increase all of these wavelengths if we could just
find a way to straighten out the waves!
Seriously, tho. Nice explanation.
Monkey Pi- Hide quoted text -
- Show quoted text -
Another Reply (short and simple)
"It's the distance, or "length", that the signal in question would
travel while transitioning through a complete cycle.
An audible signal will generally travel at the speed of sound, and
light (different wavelengths, different colors) will travel at the
speed of light.
Does that help? "- Hide quoted text -
- Show quoted text -
HOWEVER, Sometimes a wave amplitude can be a length, for example a
wave on the surface of water or a wave on the surface of a drum.
Basically, these are special cases. Sorry, i forgot these obvious
The x-ray mirrors are seriously shiny but look like small cones with
holes at both ends. They are made of metal (electroformed nickel)
with an inner surface of gold. If you hold them up to the sun, they
will concentrate the sunlight like a parabolic mirror would. I'll
resist the urge to go on and on about how they work and bore you to
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