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[Phys-L] Re: Microwave experiments



Ken said, "My understanding has been that the E component of the em
radiation causes the energy to be absorbed in the tines. Is that a
reasonable explanation?"

I would say that is partly correct. It is my understanding that when
the E component is oscillating in the same direction as the tines, the
conduction electrons can move more. That does two things: absorption
*and* reflection.

Remember that a solid sheet of metal reflects the microwaves, so why
would you not expect the slotted metal to reflect? I would expect it to
reflect, and I would expect it to reflect more when it looks more like a
solid sheet. It will look more like a solid sheet then the tines are
parallel to the E oscillation.

When the tines are perpendicular to the E oscillation, the tines absorb
less, reflect less, and transmit more. When the tines are parallel to
the E oscillation the tines absorb more, reflect more, and transmit
less.

I would guess the reflections from multiple tines would create the
possibility of interference phenomena and that could be why you notice
the fluctuations as you move the tines or detector.

Michael D. Edmiston, Ph.D.
Professor of Physics and Chemistry
Bluffton University
Bluffton, OH 45817
(419)-358-3270
edmiston@bluffton.edu
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