Re: basic question about light

On Feb 10, 2:25 pm, "Androcles" <Engin...@xxxxxxxxxxxxxxxxxxxxxx>
wrote:
"Randy Poe" <poespam-t...@xxxxxxxxx> wrote in messagenews:1171133064.163815.323460@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
I asked:
Are TV signals absorbed by aluminium molecules in the antenna?

Answered 3 times already.

Yes, so you agree that molecules do not absorb all EM radiation.

No, nor did I ever say so. However, when any particular photon is
absorbed,
it is 100% gone. Its energy is translated into an excited state.

In the case of visual pigments, as I posted from several websites,
the energy of the photon is used to change the shape of the
pigment molecule.

So now that we know the answer to your question is "no", I'll
just repeat my original statement:

[A photon] is absorbed by a pigment molecule in your retina.

http://www.catalase.com/retina.gif

Those rods and cones are antennae.

No, they really aren't.

They are not elephantment,
hogment or dogment molecules, nor are the optic nerve fibres attached
to the (reflective - check out a cat's eye) pigment layer.

The problem is biologists know less physics than Tom Roberts

If you'd actually read the quotes I provided, you'd learn that
vertebrate visual reception begins with a photon causing a
molecule to change shape. That then induces a series of
enzyme-catalyzed reactions.

Nothing like that happens in an antenna.

You will find a description of photon absorption followed by molecular
shape change, followed by the enzyme cascade, in any description
of how light is transduced in the retina.

You will not find a description of rods and cones as "antennae".

- Randy

.

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