Jim Kelley wrote:
Waves cannot just "cease to exist" for
the very same reason that energy cannot cease to exist.

More bafflegab. An RF wave ceases to exist when it is dissipated
in a dummy load. The energy cannot cease to exist and turns to
heat but the RF wave, in a perfect dummy load, ceases to exist.
Heat is not RF. A light wave incident upon a perfect flat black
plane ceases to exist. The light waves that haven't exited the
room you are in when you turn off the light cease to exist. Some
light waves falling upon plants cease to exist in the process of
photosynthesis.

From _Optics_, by Hecht: "Unlike ordinary objects, photons cannot
be seen directly; what is known of them comes from observing the
results of their being either created or annihilated."

When photons are created, their wave function starts. When photons
are annihilated, their wave function ceases to exist. There is no
such thing as preservation of photons. You really need to get
yourself a better physics book.

EM waves cease to exist all the time but the energy in those waves
cannot be destroyed.
--
73, Cecil http://www.qsl.net/w5dxp



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