Keith Dysart wrote:
Do photons also explain how sound can move
at a 1000 ft/s, while the air molecules barely
move at all?

No, mechanical longitudinal waves are well understood.
It is impossible for them to achieve the speed of light.

No? Not clear then why they are needed for
electrons.

Do you think electrons support mechanical waves?
The fields of TEM waves consist of photons traveling
at the speed of light.
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73, Cecil http://www.w5dxp.com