November 3rd 07, 03:23 PM
posted to rec.radio.amateur.antenna
|
|
external usenet poster
|
|
First recorded activity by RadioBanter: Jul 2007
Posts: 12
|
|
"Waves of Average Power"
Cecil flunked E&M in kindergarten.
"Cecil Moore" wrote in message
t...
K7ITM wrote:
On Nov 2, 3:58 pm, Cecil Moore wrote:
Do you know of any way to achieve wave
cancellation without any interaction between the
waves?
It's called "vector addition," not "interaction." But you already
clarified that, so I don't know why you are going on about it.
Vector (phasor) addition is necessary but *not sufficient*
for wave cancellation to occur. For wave cancellation to
occur, the two waves must be coherent, equal in magnitude,
opposite in phase, and *collinear* in the same direction.
Vector (or phasor) addition can occur with or without
"interaction". Wave cancellation cannot occur without
"interaction" between the two waves.
If the two interfering coherent waves survive the interference,
they did not "interact" probably because they were not collinear.
If the two interfering waves do not survive the interference,
they interacted, were canceled, and their energy was "redistributed
to regions that permit constructive interference" as described on
the FSU web page.
--
73, Cecil http://www.w5dxp.com
|