Art Unwin wrote:
Particles
carry just one color which is a measure of its frequency.

This is true for orbital electrons but not true for
free electrons as exist in conductors like copper
and aluminum. Free electrons can emit photons of any
frequency. We change the transmitting frequency of
the photons by adjusting our VFOs to virtually
limitless frequencies.
--
73, Cecil, IEEE, OOTC, http://www.w5dxp.com